a=p(1+r)^n

p=$4000,r=0.10, and n=2years
at the end of 2 years A is

I'm assuming the account is compounded

annually.

A = Po(1+r)^n

n = 1comp/yr. * 2yrs. = 2 Compounding periods.

A = 4000(1.1)^2 = $4840.