A sum of money at simple interest rate amounts to Rs 4,025 in 3 years and to Rs 4,550 in 6 years at the same rate of interest. Find the rate of interest per annum?
a. 6%
b. 5%
c. 4%
d. 3%

• (C) I for 3 years = Rs 4550 – 4025 = Rs 525
  A = P + I ∴ P = 4025 – 525 = Rs 3500
  R = 525*100 / 3*3500 = 5 :)
  ans is 3500 and 5%
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