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: if rs . 420 amount to rs . 540 in 4 years , what will it amount to in 6 years at the same rate % per annum ? 
Options: a ) s . 575 , b ) s . 595 , c ) s . 590 , d ) s . 600 , e ) s . 585
[EX A]: d

[EX Q]: Problem: a reduction of 40 % in the price of bananas would enable a man to obtain 50 more for rs . 40 , what is reduced price per dozen ? 
Options: a ) 1.34 , b ) 2.84 , c ) 3.84 , d ) 4.34 , e ) 5
[EX A]: c

[EX Q]: Problem: what is the normal price of an article sold at $ 126 after two successive discounts of 10 % and 20 % ? 
Options: a ) $ 155 , b ) $ 165 , c ) $ 175 , d ) $ 185 , e ) $ 195
[EX A]:
c