Question

How long will it take a certain amount to increase by 30% at the rate of 15% simple interest?

Answer 1

P=100

after increase of 30%=l 30

100+100x XxI5/100=130

100+15x=130

100+ 15x=130

15x=130-100

15x=30

X=2yrs

Answer 2

Answer:

It takes 2 yrs to a certain amount to increase by 30% at the rate of 15% simple interest

Step-by-step explanation:

Let Principal (P) = Rs. 100

%Increase in Principal = 30%

∴Amount(A) = principal + increase in principal

Amount = 100 + 30 =Rs.130

S.I = A - P

    = 130 - 100 =Rs.30

Rate of interest (r) = 15% per annum

S .I =( P× r× t) /100

Time = (S.I ×100) / (P×r)

         =(30×100) /(100×15)

         = 2 yrs.