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A stationery retailer generally prices portable computers using a 30 percent markup. The retailer expects to sell 100 portable computers at the 30 percent markup. How many units would it have to sell at a 10 percent increase in price from the original price to maintain the same gross profit?

  • math -

    Let the original cost price be 1000.
    100 computers at 30% markup brings a profit of 100*(1000*30%)=30000

    If the original price goes up 10% (cost =1100), the new profit per computer is 1300-1100=200

    Number computers required to maintain the same total profit
    = 30000/200=150

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