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:  Select:
A) Rs. 20
B) Rs. 21.80
C) Rs. 22
D) Rs. 22.33
E) Rs. 18.33
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.(20/120)x100=Rs.18.33   answer:Rs. 18.33
<result>E</result>
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: