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Add return on investment to maths #263

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Add return on investment to maths #263

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20 changes: 20 additions & 0 deletions maths/return_on_investment.dart
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/// Calculates Return on Investment (ROI) as a percentage.
/// ROI measures the profitability of an investment relative to its cost.
///
/// Formula: ROI = (Gain - Cost) / Cost * 100
///
/// Reference: https://www.investopedia.com/terms/r/returnoninvestment.asp

double returnOnInvestment(
double gainFromInvestment, double costOfInvestment) {
if (costOfInvestment <= 0) {
throw ArgumentError('costOfInvestment must be greater than 0');
}
return (gainFromInvestment - costOfInvestment) / costOfInvestment * 100;
}

void main() {
print(returnOnInvestment(1000, 500)); // 100.0
print(returnOnInvestment(500, 500)); // 0.0
print(returnOnInvestment(200, 500)); // -60.0
}