Asmita invests an amount of Rs 9535 at the rate of 4 per cent per annum to obtain a total amount of Rs 11442 on simple interest after a certain period. For how many year did she invest the amount to obtain the total sum?
(a) 10 years
(b) 2 years
(c) 5 years
(d) 4 years
(e) None of these