Question

solve the 2nd question

Answer 1

Interest of 1st 1/2 year =12800*15*1/100*2*2
=Rs 7680
Amount =12800+7680
= Rs 20480
Interest of 2nd 1/2 year =20480*15*1/100*2*2
=Rs 12288
Final amount =20480+12288
=Rs 32768

Answer 2

Given principal = 12800.

Given n = 2 year.

Given R = 15/2% (Compounded semi-annually = 15/4%).

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

                            = 12800(1 + 15/400)^2

                            = 12800(415/400)^2

                            = 12800 * 415/400 * 415/400

                            = 88179200/6400

                            = 13778.


Therefore the amount he has to pay after one year = 13778.


Hope this helps!