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: a retailer bought a machine at a wholesale price of $ 108 and later on sold it after a 10 % discount of the retail price . if the retailer made a profit equivalent to 20 % of the whole price , what is the retail price of the machine ?
Options: a ) 81 , b ) 100 , c ) 120 , d ) 135 , e ) 144
[EX A]: e

[EX Q]: Problem: a shopkeeper sells 300 metres of cloth for rs . 18000 at a loss of rs . 5 per metre . find his cost price for one metre of cloth ?
Options: a ) 12 , b ) 27 , c ) 29 , d ) 50 , e ) 65
[EX A]: e

[EX Q]: Problem: what is the rate percent when the simple interest on rs . 800 amount to rs . 128 in 4 years ?
Options: a ) 5 % , b ) 3 % , c ) 4 % , d ) 9 % , e ) 1 %
[EX A]:
c