amount of an annuity due

例句：

1. 1.The amount of the loan is $5000.
   贷款的金额是5000美元。
2. 2. The total amount of the expenses was $2000.
   所有费用的总和是2000美元。
3. 3.The amount of the tax refund depends on your income.
   退税的金额取决于你的收入。