An account earns simple interest.

$2000 at 3.5% for 4 years

$2280

Explanation:

I see you've already found part a, which is to find the amount of interest earned. The next part is easy, to find the balance of the account after four years, just add the interest you've found back to the principal (the original size of the account or loan). $2000 + $280 equals $2280.

$2280

Explanation:

doctrine that the us had the right to expand throughout north america.