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True Discount - General Aptitude

Q1:

Rs. 20 is the true discount on Rs. 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 Rs. 10

B Rs. 10.40

C Rs. 15.20

D Rs. 13

ANS:B - Rs. 10.40

S.I. on Rs. (260 - 20) for a given time = Rs. 20. S.I. on Rs. 240 for half the time = Rs. 10. T.D. on Rs. 250 = Rs. 10.

 T.D. on Rs. 260 = Rs. 10 x 260 = Rs. 10.40
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