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Electric Depot sells boxes of high efficiency light bulbs ($8 box) and switch plates ($10 each). In June, total sales were $42000.
b. Electric Depot sells boxes of high efficiency light bulbs ($8 box) and switch plates ($10 each). In June, total sales were $42000. Customers bought 5 times as many boxes of light bulbs as switch plates. How many of each did Electric Depot sell?