Aptitude - Simple Interest - Discussion

This answer would actually keep changing according to the rate of interest that we take which will in-turn change the principal amount. That is if we take r as 5 and 7 then the answer will be Rs 700. So unless and until we are provided with the correct principal amount I guess we cannot find the exact answer.

Please correct me if I am wrong. Thank you.

@ALL

SI = (PRT/100)

By applying given data in the above formula

1750 = (P x R x 7/100)

In order to find rate 'R', we need the value of 'P' (Principal amount).

Since the principal is not given, so data is inadequate.

Sorry we cant understand ?

As SI is directly proportional to R..

so if r is increased by 2 %

SI will also increase by 2 %

so ans is 35(2% of 1750)

let me kno if i m wrong.. :)

S.I. for 1 year = 1750/7=250
increase by 2% = 250*2/100=255
every yr he would get extra 5 rs

So for 7 yrs = 5 * 7= 35

I can't understnd the solution, can you please explain clearly ?

As according to question the principal is same in both cases. For first case we have: 1750 = (P*R*7)/100.

Again according to question new Rate is 2% more, i.e (R + 2% of R) or (51*R)/50. Now new Interest would be: I = (P*51R*7)/(50*100).

Now solve these two equations by putting value of PR from first in second equation. The answer comes is Rs.35.

Solution given by Singh Abhishek and Rahul are also correct. My way of solving is very basic solution.

GIven that: (P*R*7)/100 = 1750

Now we have to find : P*(R+2)*7/100 = ?

But we cannot find P and R both from just one equation.
Hence Cannot be determined

Folks, there is a answer for this question and is Rs.35.

As former persons said that answer depends on Amount or principal. its not so.... please check with different principal amount assumptions and match your answers... always same .. 35 is difference and and second case SI is always 1785, never mind whatever assumptions made, if P is assumed 10000 then R comes out to be 2.5% if P is assumed 5000 then R comes out to be 5%, but SI for 2% more rate always is 1785. so there is fix answer for the question.

Please anyone correct me if I'm wrong. I solved the problem in following way
let p be the sum and r rate of interest
1750=p*r*7/100..........(1)
Now r if increased by 2% interest becomes 1.2r
Now equation for S.I=p*1.2r*7/100
By multiplying equation 1 by 1.2 on both sides we get
p*1.2r*7/100=1.2*1750=2100
So 2100-1750=350 is the answer