A farmer borrowed ₹ 3600 at 15\% simple interest per annum. At the end of 4 years, he cleared this account by paying ₹ 4000 and a cow. The cost of the cow is
(a)₹ 1000
(b)₹ 1200
(c)₹ 1550
(d)₹ 1760
Answer
Answer (as printed): D
Explanation
$P=₹ 3600, R=15 \%, T=4 \mathrm{yrs}$. $$\text { ∴ S.I. }=₹\left(\frac{3600 \times 15 \times 4}{100}\right)=₹ 2160 .$$ Hence, amount after 4 years $=₹(3600+2160)=₹ 5760$. $$\text { ∴ Cost of the cow }=₹(5760-4000)=₹ 1760 .$$
Explanation as extracted from the printed page; notation may be imperfect.