The first thing you have to do is know the equation. The equation is a(1+p)^t. a= the amount of money p= the percent represented as a decimal and t=time ( the t is raised as an exponent) so, in this case, it is represented as 200(1+0.05)^2\ 200(1.05)^2 200(1.1025) 220.5 That is how much extra he would owe in interest fee's
