Question

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:

• A. $Rs.20$
• B. $Rs.21.81$
• C. $Rs.22$
• D. $Rs.18.33$

Answer 1

The correct option is D $Rs.18.33$

S.I. on $Rs.(110-10)$ for a certain time $=Rs.10$.
S.I. on $Rs.110$ for double the time $=Rs.20$.
T.D. on $Rs.120=Rs.(120-100)=Rs.20$.
T.D. on $Rs.110=Rs.(\frac{20}{120}\times 100)=Rs.18.33$