A lent Rs. 600 to B for 2 years and Rs. 150 to C for 4

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A lent Rs. 600 to B for 2 years and Rs. 150 to C for 4 years and received altogether from both Rs. 90 as simple interest. The rate of interest is ?

Let rate = R% per annum.
Then, [(600 x R x 2)/ 100 ] + [(150 x R x 4 ) / 100] = 90
⇒ 18R = 90
∴ R = 5%