Discussion :: True Discount

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:
Answer : Option D
Explanation :
S.I. on Rs. (110  10) for a certain time = Rs. 10.
S.I. on Rs. 100 for double the time = Rs. 20.
T.D. on Rs. 120 = Rs. (120  100) = Rs. 20.
T.D. on Rs. 110 = Rs\([\frac { 20 } {1 2 0}*110]\)= Rs. 18.33
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