Aptitude - Simple Interest - Discussion

I think 245 is correct as they asked for Increase in interest. So 2% of total interest earned for 7 year is 245. Please clarify me if it is wrong one.

Hi @Anusha,

As in question given, 2% more interest than the first case,
So, rate of interest = r+(2r/100) = 102r/100.

Hope understood.

Please anyone confirm that what is the correct answer or data is not sufficient. As Indiabix says answer "Cannot be determined".

Here the ans is sp=3500
prinicipal amount is same so p1=p2=x,time is same,the rate is different r,2r

p1=p2
sp1*100/t1r2=sp2*100/t2r2
1750/(7*r)=sp/(7*2r)
sp=3500
so sp2-sp1=1750

If are increased by 2% interest becomes 1.02r.

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

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.

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

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.

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