instruction:
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'.
question:
Problem: the unit digit in the product ( 784 x 618 x 917 x 463 ) is : 
Options: a ) 5 , b ) 9 , c ) 16 , d ) 2 , e ) 42
answer:
d


question:
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 %
answer:
c


question:
Problem: if n is a positive integer and n ^ 2 is divisible by 50 , then what is the largest positive integer that must divide n ? 
Options: a ) 5 , b ) 8 , c ) 10 , d ) 20 , e ) 25
answer:

c