Arlo invested $4000 in an account that earns 5.5% interest compounded annually the formula for compound interest interest is a (t)=p(1+l). how much did arlo have in the account after 4 years

For compounding interests, we use the equation F = P (1+i)^n where F is the future amount of the principal amount, P, in n years. Take note that the interest to be used should be the effective interest rate. In this case, it is already the effective interest rate.

F = P (1+i)^n
F = $4000 (1+.055)^4
F = $4955.2986

Letter c i’d say