(A) Rs. 20 (X)
(B) Rs. 21.81 (X)
(C) Rs. 22 (X)
(D) Rs. 18.33 ()
Answers: 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. 18.33.