The formula to determine yearly compound interest is

a- amount
p- Is the principal the principal is the amount borrowed
r- is the rate
t- is the time
We will input all the numbers from our question into the formula.

Our rounded calculation is <span>59245.15
Roy will have to pay </span>
59245.15
It is 140 degrees. You set the two equations equal to each other and you solve for x. After that, you can plug it into the first equation and get the answer. In this case, X is equal to 4.