An amount fetched a total simple interest of Rs. 3200 at the rate of 6.25 %/yr in 4 years. What is the amount (in Rs)?
$$I=\frac{PTR}{100}$$
$$3200=\frac{P*4*6.25}{100}$$
$$3200=\frac{25*P}{100}$$
$$P=12800$$
So the answer is option C.
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