Simple interest means that the interest is the same each year. In this case, `8 % ` of `$ 1 6 , 0 0 0 ` is `0.08 * 1 6 , 0 0 0 = 8 * 1 6 0 = 1 , 2 8 0 ( $ )...

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Simple interest means that the interest is the same each year. In this case, `8 % ` of `$ 1 6 , 0 0 0 ` is `0.08 * 1 6 , 0 0 0 = 8 * 1 6 0 = 1 , 2 8 0 ( $ ) ` per year. The quicker the loan is paid, the smaller is the total interest.

This way, if the entire loan will be repaid in `n ` years, the interest paid will be `1 , 2 8 0 n ` dollars. Of course, the principal amount of `$ 1 6 , 0 0 0 ` must be repaid also, so the total sum is `1 , 2 8 0 n + 1 6 , 0 0 0 ` dollars.

Each month, Nanako pays `$ 2 5 0 , ` which means `$ 3 , 0 0 0 ` a year. In `n ` years, she'll pay `3 , 0 0 0 n ` dollars, so we get an equation for `n . `

`3 , 0 0 0 n = 1 , 2 8 0 n + 1 6 , 0 0 0 .`

To solve: `1 , 7 2 0 n = 1 6 , 0 0 0 , ` `1 7 2 n = 1 , 6 0 0 , ` `4 3 n = 4 0 0 . ` So, `n = ( 4 0 0 ) / ( 4 3 ) approx 9 . 3 ` (years), which is about 9 years and 4 months.