The difference between the interests earned when Rs P is invested for four years in a scheme offerin...........

Quantitative Aptitude (SBI-CL) Simple Interest

The difference between the interests earned when Rs. P is invested for four years in a scheme offering 9% p.a. Simple interest and when the same sum (Rs P) is invested for two years in another scheme offering 12% p.a. simple interest, is Rs 480. What is the value of P?