SOLUTION: The manager of an appliance store purchased a number of identical lamps for $8000.After selling all but 4 of the lamps at an average profit of $100 each, the investment of $8000 ha

Question 894804: The manager of an appliance store purchased a number of identical lamps for $8000.After selling all but 4 of the lamps at an average profit of $100 each, the investment of $8000 had been regained. How many lamps did the manager purchase?
Found 2 solutions by josgarithmetic, MathTherapy:
Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!
THE INVESTMENT OF $8000 REGAINED.

n=number of lamps purchased.
n-4, number of lamps sold.
PROFIT, .

Cost was .

, profit is revenue minus cost. Revenue is r.

Something is still missing.
Answer by MathTherapy(10552) (Show Source): You can put this solution on YOUR website!

The manager of an appliance store purchased a number of identical lamps for $8000.After selling all but 4 of the lamps at an average profit of $100 each, the investment of $8000 had been regained. How many lamps did the manager purchase?

Number of lamps purchased:
You can do the check!!
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