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: mary works in a restaurant a maximum of 70 hours . for the first 20 hours , she is paid $ 8 per hour . for each overtime hour , she is paid at a rate which is 25 % higher than her regular rate . how much mary can earn in a week ? 
Options: a ) 600 , b ) 620 , c ) 660 , d ) 320 , e ) 400
[EX A]: c

[EX Q]: Problem: the cost price of a radio is rs . 1500 and it was sold for rs . 1110 , find the loss % ? 
Options: a ) 18 , b ) 16 , c ) 26 , d ) 17 , e ) 11
[EX A]: c

[EX Q]: Problem: by selling 9 pencils for a rupee a man loses 20 % . how many for a rupee should he sell in order to gain 20 % ? 
Options: a ) 8 , b ) 9 , c ) 7 , d ) 4 , e ) 6
[EX A]:
e