RL Enterprises issues a $600,000 adjustable rate mortgage note on January 1, 2020. The initial interest rate is 7%, but will move up or down each year with the market rate. Annual December 31 installment payments are $75,000, exclusive of taxes and insurance. If RL's interest rates are 7% in 2020, 6.5% in 2021, 7% in 2022, and 8% in 2023, what is RL's principal balance after the December 31, 2023 payment? O $490,874.85 $416,556.43 O $429,000.00 O $455,144,84