In this task, you need to answer the given multiple-choice question on the gain. Gain is the value by which to multiply the input. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

[EX Q]: Problem: at what rate percent per annum will the simple interest on a sum of money be 4 / 5 of the amount in 10 years ?
Options: a ) 4 % , b ) 7 % , c ) 8 % , d ) 3 % , e ) 1 %
[EX A]: c

[EX Q]: Problem: if price of t . v set is reduced by 10 % , then its sale increases by 85 % , find net effect on sale value
Options: a ) 44 , b ) 45 , c ) 46 , d ) 67 , e ) 48
[EX A]: d

[EX Q]: Problem: a sum fetched a total simple interest of $ 4106.25 at the rate of 9 p . c . p . a . in 5 years . what is the sum ?
Options: a ) $ 8829 , b ) $ 2840 , c ) $ 6578 , d ) $ 7782 , e ) $ 8927
[EX A]:
e