please help me with 8-10 plz

Use the given information to complete problems 8-10. Priit took out a loan for $50,000 in order to purchase some land. The following table shows his repayment schedule. Previous Interest Principal New Quarter balance Payment payment payment balance 1 $50,000.00 $3,000.00 $875.00 $2,125.00 $47,875.00 2 $47,875.00 $3,000.00 $837.81 $2,162.19 $45,712.81 3 $45,712.81 $3,000.00 $799.97 $2,200.03 $43,512.79 4 $43,512.79 $3,000.00 $761.47 $2,238.53 $41,274.26 5 $41,274.26 $3,000.00 $722.30 $2,277.70 $38,996.56 6 $38,996.56 $3,000.00 $682.44 $2,317.56 $36,679.00 7 $36,679.00 $3,000.00 $641.88 $2,358.12 $34,320.88 8 $34,320.88 $3,000.00 $600.62 $2,399.38 $31.921.50 9 $31,921.50 $3,000.00 $558.63 $2,441.37 $29,480.12 10 $29,480.12 $3,000.00 $515.90 $2,484.10 $26,996.03 11 $26,996.03 $3,000.00 $472.43 $2,527.57 $24,468.46 12 $24,468.46 $3,000.00 $428.20 $2,571.80 $21,896.65 13 $21,896.65 $3,000.00 $383.19 $2,616.81 $19,279.85 14 $19,279.85 $3,000.00 $337.40 $2,662.60 $16,617.24 15 $16,617.24 $3,000.00 $290.80 $2,709.20 $13,908.05 16 $13,908.05 $3,000.00 $243.39 $2,756.61 $11,151.44 17 $11,151.44 $3,000.00 $195.15 $2,804.85 $8,346.59 18 $8,346.59 $3,000.00 $146.07 $2,853.93 $5,492.65 19 $5,492.65 $3,000.00 $96.12 $2,903.88 $2,588.77 20 $2,588.77 $2,634.08 $45.30 $2,588.78 $0.00 8. What is the quarterly interest rate? 9. Find a recursive formula to model the new balance in terms of the previous balance. 10. Suppose Priit pays $3,600 each quarter instead. What formula would model this situation