Mike has deposited $1,000 at the end of each year into a retirement savings plan for the last seven years. His deposits earned interest at 7% per year for the first 4 years and at 8.25% per year for the next 3 years. What is the value of his entire retirement plan, at the end of the seventh year? O $8,886.29 O $4,495.37 O $7,694.25 O $8,654.02