Why should not subsract with 854? Please clear my doubt....

Priya said:
(Mon, Nov 29, 2010 10:04:37 AM)

@Lavanya and kanna

To get 1 year difference we have to subtract
4year amount-3year amount
this difference amount is the 1 year simple interest..
that's why..
Rs. (854 - 815) = Rs. 39
39 is 1year S.I.

hope it helps you..

Nag said:
(Tue, Feb 8, 2011 10:15:04 AM)

Thank you. This is explanation is very helpful for me.

Appu said:
(Mon, Feb 21, 2011 08:29:22 PM)

Hai friends,

Principle is the amount borrowed. Here, explain about SI of 3 years and 4 years. Assume P is the principal then, P+854 for 4 years and p+815 for 3yrs.

So here it is necessary to find the SI of one year and subtract it from the 3 year or 4 year.

That is, (815-117) = 698 and 854-156=698.

Vishnu said:
(Tue, Mar 8, 2011 05:03:11 AM)

To get a si of one year or it might be two years if it is two year we have to divide it by two si=3yrs -2yrs willl give u one year si why should we have to go to risk.

Ramesh said:
(Fri, Mar 18, 2011 07:15:04 AM)

PTR/100 = 815
P*3*R/100 = 815
R/100=854- 815
p * 3 * 39 = 815
P * 117 = 815
p = 815-117 = 698

Hari said:
(Sat, Mar 26, 2011 03:14:01 AM)

I like this type of solutions thank you

I think this answer also

1year 854-815=39

3years 39*4=156

854-156=698

Vijay said:
(Fri, May 27, 2011 12:52:26 AM)

What is formula of simpe interest ?

Rajini Kumar said:
(Fri, Jun 3, 2011 12:38:38 PM)

S.Ib = PNR/100

Narasimha Reddy said:
(Sat, Jun 4, 2011 07:01:21 AM)

S.I=PTR/100

Gayathri said:
(Wed, Jun 22, 2011 01:15:27 AM)

Hi Friends!
Principle = the amt u borrowed
Interest = the small additional amt u pay for the amt u
borrowed

First let me explain u d question
In the question,
A sum of money at simple interest amounts to Rs. 815 in 3 years means the Principle amt together wit the interest paid for 3 yrs is Rs. 815 and similarly Principle amt together wit the interest paid for 4 yrs is Rs. 854

Therefore, if we subtract (854-815) we get the simple interest for 1 year as Rs. 39

Then, we calculate simple interest for 3 yrs as (39*3)= 117

Next step, we subtract (815 - 117) to get Principle amt for a yr as Rs. 698

Brief explanation for last step:

815 = Principle amt + int for 3 yrs ......equation 1
117 = int for 3 yrs ......equation 2

now subtract both equations, we get the principle amt

(815 - P)/(854 - P) = 3/4
Solving this eq, we get
P = 698

Uma said:
(Tue, Aug 16, 2011 09:40:22 PM)

@gayathri your explination is very helpfull.

Thank you.

Harsh said:
(Tue, Sep 13, 2011 08:29:52 PM)

I am not deciding which is easiest way to solve of the given question so please suggest me.

Venkatesh said:
(Mon, Sep 19, 2011 12:35:32 PM)

Gayathri thank you so much before that I want to say myself I am dull even though I understood you are explantion it is very clear keep it up.

Jaya said:
(Mon, Sep 26, 2011 08:45:43 PM)

Gayathri thanks a lot its vry clr & simple

Kichu said:
(Mon, Oct 24, 2011 07:03:35 PM)

Thanks gayathri.

Muskan said:
(Sun, Nov 20, 2011 03:53:53 PM)

Please give me the solution of this question.

A certain sum given on simple interest became double in 20 years. In how many years will it be 4 times.

Ranjitha said:
(Tue, Dec 27, 2011 10:54:07 PM)

Its same friends.. you can do it in either way
(39*4)=156
854-159=698 only

Sonia said:
(Thu, Dec 29, 2011 08:12:49 PM)

Thanks Gayathri. Really your explanation is helpful.

Venkatesh Kumar said:
(Tue, Jan 17, 2012 09:12:48 PM)

Thanks Gayathti for giving detailed explanation.

Saurabh said:
(Tue, May 1, 2012 12:30:27 AM)

Thanks gayathri.

Tejashree said:
(Fri, Jun 8, 2012 09:21:58 PM)

Thanks gayathri

Radhika said:
(Sat, Jun 23, 2012 01:18:17 PM)

Thank you so much Gayathri.... very good explaination

Moksh said:
(Sat, Jul 21, 2012 12:06:23 AM)

@Gayathri.

Thanks a lot dear.

Very useful answer :).

Ismail Khan said:
(Fri, Aug 17, 2012 12:33:54 AM)

Amount for three years is 815
so AMOUNT= p + SI
A = p + pin
815= p + 3pi.......... (1)
similerly for 4 years
854 = p +4pi..........(2)
subtracting equation (1) from(2) we get
39 = pi
or
pi =39
put this value of pi in equation (1) we get
815= p+ 3*39
815= p+ 117
815-117=p
p=698

Satish said:
(Mon, Sep 3, 2012 09:43:34 AM)

@Gayahthri explained good .

Sudesna said:
(Wed, Sep 4, 2013 03:01:15 PM)

When we apply the formula SI = PRT/100.

And when we apply the formula Amount = P+SI.

Sumit Singh said:
(Mon, Dec 23, 2013 09:16:13 AM)

815 ------ 854 (This value 39 increase in 1 year ).

So in four year 39*4/156.

This 156 is interest in four year.

So principle is equal to / 854-156 equal to 698.

Varunraj said:
(Sat, Jan 4, 2014 03:51:30 PM)

If we take for four years.

39*4 = 156.

854-156 = 698 is the answer.

If we take three years.

39*3 = 117.

815-117 = 698 the answer is same !

We can do both the way.

Ravi said:
(Fri, Mar 28, 2014 05:00:20 PM)

If in this question asked rate also then how to solve this question?