6. In cell K4, create a formula using the IF function to calculate the interest paid on the mortgage (or the difference between the total payments made each year and the total amount of mortgage principal paid each year). a. The formula should first check if the value in cell H4 (the balance remaining on the loan each year) is greater than 0. b. If the value in cell H4 is greater than 0, the formula should return the value in J4 subtracted from the value in cell D5 multiplied by 12. Use a relative cell reference to cell J4 and an absolute cell reference to cell D5. (Hint: Use 12*$D$5-J4 as the is_true argument value in the formula.) c. If the value in cell H4 is not greater than 0, the formula should return a value of 0. Copy the formula from cell K4 into the range K5:K18.