Question

Karan invested Rs. (x + 500) in a scheme A offering simple interest of 16% p.a., and the interest received after 2 years is Rs. 640. He invested Rs. 2x in scheme B at a rate of R% p.a. in simple interest, and the total amount received in scheme B after 3 years is Rs. 6240. Find the value of R.

A 36%
B 50%
C 42%
D 24%
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