1. the loan is a yuan, with monthly interest p, which is paid off in n months. The monthly payment is x = AP (1+p) n {[(1+p) n]-1}. Total payment =nx. Repayment of loans = NX-A.2. Repayment of equal principal and interest. The loan is a yuan, and the monthly interest rate is p, and it will be paid off in n months. A/n yuan will be repaid with interest every month, and [(n+ 1-i)p+ 1]A/n yuan will be repaid in the first month. Actual * * * Payment due [(n+ 1)p+2]A/2 yuan. 3. The loan is RMB A, with a monthly interest rate of P, which will be paid off in m installments within n months, with each repayment x = a (1+p) n {[(1+p) (n/m)]-1}/[(1+p). * * * pay mx yuan. Pay mx-A yuan more than the loan.