Ivan took out a fully amortizing 30 year mortgage with the initial balance of $288743. This mortgage has a foxed-annual interest rate at 7%. After Ivan has completed 4 full years of monthly payments. how much have has lvan paid toward principal? Same question in different words, what is the difference between mortgage balance at orgination and mortgage balance remaining after 4 years of montly payments? Round your answer to the nearest cent (e.9. If your answer is $7000.9873, enter 7000.99)