Question 1061599
FV=C(1-i/n)-1 divided by i/n
FV=300(1+(0.08/12)^420-1 divided by 0.08/12
not rounding until the end, I get 16.29-1 for the parentheses 
FV=300(15.29)/0.08/12=
$688,164.75
The amount deposited was $3600 per year for 35 years or $126,000
The amount of interest earned is 688164.75-126,000=$562164.75