The buyer saves $76000 in interest with the 20-year option.
If P be the principal amount, t be the time
And R be the rate of interest.
Then, Simple Interest(S.I.) = (P×R×t)/100
The down payment is of 5%
The price of the small cabin is $100000
Hence the principal is 95% of the price.
P = $(100000×0.95) = $95000
For 20 years option,
P = $95000 , R = 8%, t = 20 yrs
S.I. = (95000×8×20)/100 = 152000
So, the amount of interest paid for the 20 years is $152000
For 30 years option,
P =$95000, R=8%, t = 30 yrs
S.I. = (95000×8×30)/100 = 228000
So, the amount of interest paid for the 30 years is $228000
∴ The buyer saves $(228000-152000) = $76000 in interest with the 20 years option.
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