def taxFromEarnings(rates, earn): tax = 0 for (rate, level) in orderedRates(rates): left = earn - level if left > 0: earn = left tax += level * rate else: # they're in this band tax += earn * rate break return tax
def earningsFromTax(rates, tax): if tax == 0: return "Up to %s" % rates[0] earn = 0 for (rate, level) in orderedRates(rates): max_tax = level * rate # at this band # print rate, level, max_tax, tax if tax > max_tax: tax -= max_tax earn += level else: # they're in this band earn += tax / rate break return earn
