Use the formula A = P(1 + (r/n)) ^nt
A: final amount
P: starting amount
r: interest rate change to a decimal
n: number of times compounded
t: time in years
A = 2717(1 + (.08/12))^12*20
A = 2717(1.0067)^240
A = 2717*4.9268
A = 13,386.12