说明：  海萍夫妇为了彻底告别“蜗居”生活，痛下决心贷款60万元购买了一套三居室 。 若贷款月利率为0.5 ，还款期限为120个月，还款方式为等额本金还款法（即贷款期限内每期 以相等的额度偿还贷款本金，贷款利息随本金逐期递减）。试求出每个月还款的本金、每个月 的利息以及总利息分别是多少元。 若还款方式采用等额本息还款法（即贷款期限内每期以相 等的额度偿还贷款本息，贷款利息随本金逐期递减）。试求出每个月还款的本金、每个月的 利息以及总利息分别是多少元。
(Haiping couple in order to bid farewell to " dwelling" life, faced up to 600,000 yuan loans purchased a three-bedroom. If the lending interest rate of 0.5 in January, the repayment period of 120 months, repayment is equal principal repayment method (ie, within the term of the loan in equal installments of principal repayment of the loan amount, loan interest of decreasing gradually with the principal ). Find the monthly repayment of principal, interest and total interest each month how many dollars respectively. If the repayment of principal and interest repayment method using equal (ie, within the term of the loan in equal installments of principal and interest repayment of the loan amount, loan interest with the principal by period descending). Find the monthly repayment of principal, interest and total interest each month how many dollars respectively.)