Question

its answer in answer sheet is 300 is it right or wrong

Answer 1

Let the principal(p) be 100.

We know that A = P(1+r/100)^2

                            = 100(1+10/100)^2

                            = 100(110/100)^2

                             = 100 * 1.21

                             = 121.

CI = A - P

     = 121 - 100

    = 21

Given CI = 315, principal will be = 100/21 * 315

                                                     = 1500.

SI for 1500 at 10% p.a  for 2 years will be

PTR/100 = 1500 * 2 * 10/100

                = 30000/100

                = 300.


Hope this helps!