Aptitude - Simple Interest - Discussion

6. 

A sum of Rs. 12,500 amounts to Rs. 15,500 in 4 years at the rate of simple interest. What is the rate of interest?

[A]. 3%
[B]. 4%
[C]. 5%
[D]. 6%
[E]. None of these

Answer: Option D

Explanation:

S.I. = Rs. (15500 - 12500) = Rs. 3000.

Rate = 100 x 3000 % = 6%
12500 x 4


Answer Me said: (Jun 25, 2010)  
Can someone please explain why we sub 12500 from 15500 ?

Priyanka said: (Nov 29, 2010)  
@answer me

To get amount of S.I. for four years..

Juhi said: (Jul 4, 2011)  
Amount = principal + simple interest.

Dats why we subtracted amount and principal to have the simple interest.

Yeswanth said: (Jul 30, 2011)  
Still I deosn't understand why we have to consider SI as sub 1550 from12500.

Abhishek said: (Aug 1, 2011)  
Is it like

Amount= P + S.I

Amount= P + (P*T*R)/100 ?

S.Gowthami said: (Aug 12, 2011)  
In that question we are having 3 rate values,so we substitue one by one values then we get the corrct values.for example:
p=12500
n=4
r=3 or 4 or 5 or 6

If we sub:3
12500*4*3/100=1500
1500+12500=14000,we are not getting the correct amount value then
We sub another,
12500*6*4/100=3000
3000+12500=15500,

Now we got the correct value.

Aayush Bhatnagar said: (Sep 13, 2011)  
The calculation used to calculate rate gives out 30 as the answer.

[(3000 x 100)/(12500 x 4)] = 30. NOT 6.

Can anyone throw a light on this?

Jenson said: (Sep 23, 2011)  
A boy saves Rs.4.65 daily. Find the least number of days in which he will be able to save an exact number of rupees.

Can anyone get me answer for this ?

Karuna said: (Sep 28, 2011)  
"R" means what?

Ruturaj said: (Nov 4, 2011)  
He calculation used to calculate rate gives out 150 not 6.

Gayu said: (Jul 7, 2012)  
Here, 6 is the correct answer.

15500-12500=3000.

Formula:

SI=PNR/100.

3000=12500*4*R/100.

3000*100/12500*4=R.

300000/50000=R.

R=6%.

Pandu said: (Feb 22, 2013)  
Here SI=PTR/100

So, SI=15500-12500=3000. P=12500, T=4YER,

SO 3000=12500*4*R/100,

i.e R=3000/500= 6% answer.

Johny said: (Apr 25, 2013)  
Why should we subtract 15500 from 12500?

Rajesh said: (May 17, 2013)  
We have a 12500 amount & after 4 year, we get 15500 amount so total.

Profit amount or S.I in 4 Year is 3000.

Now use the Formula:.

S.I = (P*R*T) /100.

Hemant said: (Jun 26, 2013)  
A boy saves Rs.4.65 daily. Find the least number of days in which he will be able to save an exact number of rupees.

Can anyone get me answer for this ?

Its 20 days.

Jyothi said: (Jul 10, 2013)  
In question I unable to identify which is amount and which is principal please help me. What is the difference b/w amount and principal?

Suvarna said: (Jul 24, 2013)  
6% interest amount for 12500 is 12500/100 *6 =750.

It is for 4 years thats why 12500+750+750+750+750 = 15500.

Arif said: (Oct 30, 2013)  
Simple interest = 15, 500-12, 500 = 3000.

So we compare with options which is given:

Simple interest = P*t*r/100;
3000 = 12500*4*?/100;
3000 = 125*4*3.
3000 = 1500 //not equal,then multiply by 2.
3000 = 1500*2.
3000 = 3000.

It means first we take 3% of rate we get 1500 simple interest ,then multiply by 2 means that multiply by 2 with 3% of rate that is 6%.

So, the answer is 6%.

Gyanendra Parihar said: (Nov 8, 2013)  
Total amount after 4 year is 15500 and before including interest amount is 12500 thus it is clear the interest is.

15500-12500 = 3000.

If 3000 is 4 year interest than what should be one year interest.
3000/4 = 750.

Now,
12500 is 100 percent than 750 is how many percent of 12500.

(750X12500) /100 = 6%.

Sana said: (Jan 13, 2014)  
Why subtraction take place? principle & amount is equal?

Nikhil said: (Sep 28, 2014)  
Hi. Why we took 12500 as principal?

Junaid said: (Dec 6, 2014)  
By using the formula:

I = P R T/100.

I = 15, 500-12, 500 = 3000.

3000 = 12, 500*R*4/100.

3000*100 = 12, 500*4 R.

300000 = 50000 R.

R = 300000/50000.

R = 6%.

Gopal said: (Jan 16, 2015)  
Why we take P = 12500 any why not 15500?

Suyog said: (Feb 21, 2015)  
When we do following steps:

3000*100/12500*4=96.

We get 96 as a answer, then how 6% is your answer?

Just explain me in detail.

Dozie said: (Jul 9, 2015)  
S.I per annum = (15500-12500)/4 = 750.

Rate = (S.I*100)/(P*T).

= (750*100)/(12500*4).

= 75000/50000 = 1.5.

Since interest is for four years, multiply by 4, thus; 1.5*4 yrs = 6.

Therefore are (rate) = 6%.

Shri said: (Jul 24, 2015)  
4.65*10 = 46.5.
46.5*2 = 93.
Hence 20 days.

Namit Kumar said: (Aug 19, 2015)  
Friends its very simple.

15500-12500 = 3000 /4 = 750.

750*100/12500 = 6%.

Vijayalaxmi said: (Aug 26, 2015)  
Here.

P = 12500.
T = 4 years.

Amount = S.I+P.

S.I = Amount-P.

S.I = 15500-12500 = 3000.

R = 100*S.I/P*T = 100*3000/12500*4 = 6%.

Raji said: (Dec 25, 2015)  
12500*6% = 750.
750*4 = 3000.
12500+3000 = 15500.

Rajesh said: (Dec 25, 2015)  
--> 12500*6% = 750.

---> 750*4 = 3000.

---> 12500+3000 = 15500.

Answer: 6%.

Sarath said: (Jul 17, 2016)  
I think Rajesh method is correct.

Salimjoy said: (Oct 10, 2016)  
What means PTR and SI?

V.N.Hari said: (Nov 8, 2016)  
To get simple interest from total money after four years (complete period) we need to subtract 12500 from total money.

Diptiranjan said: (Jun 7, 2017)  
It is like:

15500-12500 = 3000,
1% of Principal = 125,
3000/125=24% for 4 years.
For 1 year = 24/4 = 6%.

Kshiroda said: (Dec 6, 2017)  
To get simple interest we have to multiply principal *rate*time/100.

Sammanis said: (Dec 16, 2017)  
I don't understand. Why we didn't divide 3,000 by 4 (as it is given that the principal increased in 4 years) to get the actual S.I, that is for a single year?

Priya said: (Jan 14, 2018)  
Why we are taking as 12, 500 instead of 15,000. We are taking the number of the year (t) is 4. So we want tot take 15,500 am I right?

Dineshpalani said: (Feb 16, 2018)  
Please explain this problem.

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