<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def bcr(eal_original, eal_retrofitted, interest_rate, asset_life_expectancy, asset_value, retrofitting_cost):
 """ Compute the Benefit-Cost Ratio. BCR = (EALo - EALr)(1-exp(-r*t))/(r*C) Where: * BCR -- Benefit cost ratio * EALo -- Expected annual loss for original asset * EALr -- Expected annual loss for retrofitted asset * r -- Interest rate * t -- Life expectancy of the asset * C -- Retrofitting cost """

    return ((eal_original - eal_retrofitted) * asset_value *
            (1 - numpy.exp(- interest_rate * asset_life_expectancy)) /
            (interest_rate * retrofitting_cost))