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At Bigfoot Enterprises a wage rate of $12.70 per hour is paid on the first 37 hours
and "time-and-a-half" after that. What is the wage for a 42-hour week?
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the wage for a 42-hour week = 37*12.70 + 1.5*12.70*(42-37) dollars.
It is not Algebra - it is simple Arithmetic.