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.

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