Tony borrowed a personal loan of $15 000 from the bank. The first three months of loan payments are shown in the table. Amount borrowed $15 000 Annual interest rate (r) | 7% Monthly repayment (R) $900 Month (n) Principal (P) Interest (I) 1 $15 000.00 $87.50 This table assumes the same number of days in each month. i.e. I = Pxz P+1 P + I-R $15 087.50 $14 187.50 2 $14 187.50 $82.76 $14 270.26 $13 370.26 3 $13 370.26 $77.99 $13 448.25 $12 548.25 (a) How much interest did Tony pay in the first three months? (b) How much of the principal would be repaid after the 4th payment? (c) Tony made a payment of $6000 as the 4th payment. How much interest did he save in the 5th month