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- const interestToPayFor = (loanAmount) => {
- const greaterThan2000 = { endOfRange: Money('$2000.00'), interestPerDollar: Money('$0.09'), previousInterestPerDollar: Money('$0.00') };
- const greaterThan5000 = { endOfRange: Money('$5000.00'), interestPerDollar: Money('$0.14'), previousInterestPerDollar: Money('$0.09') };
- const greaterThan10000 = { endOfRange: Money('$10000.00'), interestPerDollar: Money('$0.21'), previousInterestPerDollar: Money('$0.14') };
- // You can move this into a configuration file so that changes
- // in the behavior doesn't require code changes
- const ranges = [greaterThan2000, greaterThan5000, greaterThan10000];
- let interestAmount = Money('$0.00');
- for (range of ranges) {
- if (loanAmount.greaterThan(range.endOfRange)) {
- interestAmount = interestAmount.plus(calculateInterest(loanAmount, range));
- }
- }
- return interestAmount;
- };
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