Module: Magelex::TaxGuess

Defined in:
lib/magelex/tax_guess.rb

Class Method Summary collapse

Class Method Details

.guess(total, tax_amount) ⇒ Object 



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# File 'lib/magelex/tax_guess.rb', line 3

def self.guess(total, tax_amount)
  if tax_amount == 0
    :tax0
  elsif (total - total/1.06) <= tax_amount && (total - total/1.08) >= tax_amount
    :tax7
  elsif (total - total/1.18) <= tax_amount && (total - total/1.20) >= tax_amount
    :tax19
  else
    raise "TaxGuess: Cannot guess tax of "\
      "#{total}/#{tax_amount} (#{total - total/tax_amount})"
  end
end