搜狗做题网一道英语数列数学题
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一道英语数列数学题
Cause I make payments of $250 per month,so 20 months will be spend till this loan had been paid off.
At the first month,I pay $250 and 1% interest on the unpaid balance,said $5000.That is to say,I'll pay $300.At the second month,I pay $250 of the principal and 1% interest of the unpaid balance,said $4750,$250 less than last month.
So I make this table as below.
(1) Your unpaid loan is 5000-250*(n-1)=5250-250n (1=<n<=20)
(2)The total interest will be $525.
At the first month,I pay $250 and 1% interest on the unpaid balance,said $5000.That is to say,I'll pay $300.At the second month,I pay $250 of the principal and 1% interest of the unpaid balance,said $4750,$250 less than last month.
So I make this table as below.
(1) Your unpaid loan is 5000-250*(n-1)=5250-250n (1=<n<=20)
(2)The total interest will be $525.