A man invested of Rs 4500 in simple interest for 3 years at 4R% p.a. and received amount of Rs 6660, then find R.

Correct option is A

ATQ,

$$\begin{aligned}&\frac{4500 \times 3 \times 4R}{100} = 6660 - 4500 \\&2160 \times 100 = 4500 \times 3 \times4R \\&R = 4\end{aligned}$$​​​