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: find the simple interest on rs . 520 for 7 months at 8 paisa per month ?
Options: a ) 277 , b ) 270 , c ) 291 , d ) 266 , e ) 121
[EX A]: c

[EX Q]: Problem: if 40 % of a certain number is 160 , then what is 90 % of that number ?
Options: a ) 270 , b ) 380 , c ) 260 , d ) 360 , e ) 290
[EX A]: d

[EX Q]: Problem: in an examination it is necessary for a candidate to get 45 % of the maximum marks to pass . a candidate who gets 180 marks , fails by 45 marks . find the maximum marks .
Options: a ) 450 , b ) 600 , c ) 500 , d ) 550 , e ) 650
[EX A]:
c