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Add ReturnOnInvestment to maths #235

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Add ReturnOnInvestment to maths #235

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14 changes: 14 additions & 0 deletions maths/return_on_investment.rb
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# frozen_string_literal: true

# 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
class ReturnOnInvestment
def self.call(gain_from_investment, cost_of_investment)
raise ArgumentError, 'cost_of_investment must be greater than 0' if cost_of_investment <= 0

(gain_from_investment - cost_of_investment).to_f / cost_of_investment * 100
end
end