Answer:
I don't need to prove it, I already believe you
Answer:
Option D. 
Step-by-step explanation:
Let
x------>the greatest possible value
we know that
If four people write the number zero, then the average will be

4/10^2 = 0.04
which is equal to:
4x10^-2
As there are two digits behind the decimal point up to( and including the 4) thus the 10^-2
And as the digit is a 4 you multiply 10^-2 by 4
35 + 3n= x
x being the total amount of stamps!
is there a substitution for n? or a number of months?