Task: Question Answering
Input (English): Problem: 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 :
Options: a. rs. 20, b. rs. 21.81, c. rs. 22, d. rs. 18.33, e. none
Output (English): d