In this task, you need to answer the given multiple-choice question on the general math. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

Problem: the tax on a commodity is diminished by 40 % but its consumption is increased by 25 % . find the decrease percent in the revenue derived from it ? 
Options: a ) 18 % , b ) 72 % , c ) 25 % , d ) 12 % , e ) 52 %
c

Problem: the difference between compound and simple interest on a certain sum of money for 3 years at 6 2 / 3 % p . a is rs . 184 . find the sum ? 
Options: a ) 33772 , b ) 26782 , c ) 26788 , d ) 13500 , e ) 27761
d

Problem: what is x if x + 5 y = 24 and y = 2 ? 
Options: a ) 1 , b ) 3 , c ) 5 , d ) 7 , e ) 14

e