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

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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) About Me  (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, p=100%2A%28n-4%29.

Cost was c=8000.

p=r-c, profit is revenue minus cost. Revenue is r.
100%28n-4%29=r-8000

Something is still missing.

Answer by MathTherapy(10552) About Me  (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: highlight_green%28highlight_green%2820%29%29

You can do the check!! 



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