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If $ 10 be allowed as true discount on a bill of $ 110 due at the end of certain time, then the discount allowed on the same amount due at the end of double the time is :
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- $ 20
- $ 21.81
- $ 22
- $ 18.33
Correct Option: D
Given :- Amount = $ 110
S.I. on $ (110 - 10) for a given time = $ 10
S.I. on $ 100 for double the time = $ 20
Sum = $ (100 + 20) = $ 120
| ∴ True discount = | Amount x Rate x Time |
| 100 + Rate x Time |
| T.D. on $ 110 = $ |  | 20 | x 110 |  | = $ 18.33 | |
| 120 |
