Solution :
Given that, Jim Tree borrowed $1,000 at 10 percent for one year. He paid a $45 processing fee and $100 in interest.
Annual Percentage Rate or APR is the annual rate charged for borrowing or earned through an investment, and is expressed as a percentage that represents the actual yearly cost of funds over the term of a loan. This includes any fees or additional costs associated with the transaction.
Jim Tree borrowed = $ 1,000
Interest rate = 10% for one year
Interest for one year =

Processing fee = $45
Total =

APR =
%
Hence, Jim Tree calculated 14.5 % (nearest tenth) APR