Question

At what rate percent per annum will Rs 3600 amount to Rs 4734 in 3 1/2 years.

Answer 1

If  it is Simple interest then,

(Principle * rate of interest * year)/100  + principle  = Amount
(3600 * r * 3.5)/100 + 3600 = 4734
(3600 * r * 3.5)/100 = 4734 - 3600
(3600 * r * 3.5)/100 = 1134
  r =  (1134 * 100)
        -----------------
           3600 * 3.5

r = 9 %

Answer 2

please see the attachment.