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: if 213 × 16 = 3408 , then 16 × 21.3 is equal to : 
Options: a ) 0.3408 , b ) 3.408 , c ) 34.08 , d ) 340.8 , e ) none of these
answer:
d


question:
Problem: what is the average of first 21 multiples of 5 ? 
Options: a ) a ) 70 , b ) b ) 77 , c ) c ) 55 , d ) d ) 81 , e ) e ) 82
answer:
c


question:
Problem: 387 x 387 + 114 x 114 + 2 x 387 x 114 = ? 
Options: a ) 250001 , b ) 251001 , c ) 260101 , d ) 261001 , e ) none of these
answer:

b