Please solve question 6

Dear Student,

The condition is that q should be of the form  $2^n\times 5^m$ (n and m are non negative integers) so that rational number $\frac{p}{q}$ has a terminating decimal expansion.

example,  $\frac{2}{5} = 0.4 , here m = 1 and n = 0 or \frac{11}{20} = 0.55, here n = 2 and m = 1$

Regards,