₹ 20 is the true discount on ₹ 260 due after a certain time. What will be the true discount on the same sum due after half of the former time, the rate of interest being the same?
(a)₹ 15.20
(b)₹ 10.40
(c)₹ 10.83
(d)₹ 13
Answer
Answer (as printed): B
Explanation
SI on ₹ (260-20) for a given $\operatorname{time}=₹ 20$ SI on ₹ 240 for half the time $=₹ 20$ TD on ₹ $250=₹ 10$ TD on ₹ $260=\frac{10}{250} \times 260=₹ 10.40$
Explanation as extracted from the printed page; notation may be imperfect.