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28.05.2021 •
Mathematics
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Answers on questions: Mathematics
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Ответ:
We start out finding the total amount he pays, including interest.
78.40/month * 12 months * 5 years = $4704
We take off the amount of principal:
4704-4200 = 504
This is the amount of interest he pays. Now we use the simple interest formula, I=prt:
504=4200(r)(5)
Multiply 4200 and 5:
504=21000r
Divide both sides by 21000:
504/21000 = 21000r/21000
0.024 = r
2.4% = r