if rs 10 be allowed as true discount on a bill..., Discount, General Mathematics

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`

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+ AnswerD

+ ExplanationS.l. on Rs.`(110 - 10)` for a certain time = Rs.`10`

S.l 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 xx 110)`


`= Rs. 18.33.`

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