If Rs. 10 be allowed as true discount on a bill of Rs. 110 due at the end of a certain time, then the discount allowed on the same sum due at the end of double the time is:

Rs. 20
Rs. 21.81
Rs. 22
Rs. 18.33

Correct answer: Rs. 18.33

Solution

From the first case, the present worth is Rs. 100 and the rate-time product can be found. Doubling the time changes the discount nonlinearly, and the new true discount comes to Rs. 18.33.

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