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 producer of tea blends two varieties of tea from two tea gardens one costing rs 18 per kg and another rs 20 per kg in the ratio 5 : 3 . if he sells the blended variety at rs 23 per kg , then his gain percent is 
Options: a ) 12 % , b ) 23 % , c ) 14 % , d ) 15 % , e ) 16 %
[EX A]: b

[EX Q]: Problem: by selling an article for $ 90 , a person gains $ 15 . what is the gain % ? 
Options: a ) 25 % , b ) 30 % , c ) 50 % , d ) 20 % , e ) 10 %
[EX A]: d

[EX Q]: Problem: a sum was put at simple interest at a certain rate for 4 years had it been put at 2 % higher rate , it would have fetched 56 more . find the sum . 
Options: a ) 500 , b ) 600 , c ) 700 , d ) 800 , e ) none of these
[EX A]:
c