SOLUTION: [ A store pays $5.50 each for calculators it buys from a supplier, plus a delivery charge of $25 per order. If the store sells the calculators for $8 each, how many calculators mus

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: [ A store pays $5.50 each for calculators it buys from a supplier, plus a delivery charge of $25 per order. If the store sells the calculators for $8 each, how many calculators mus      Log On


   

Question 824667: [ A store pays $5.50 each for calculators it buys from a supplier, plus a delivery charge of $25 per order. If the store sells the calculators for $8 each, how many calculators must be ordered and sold to produce a profit of $80 ]
Answer by TimothyLamb(4379) About Me  (Show Source):
You can put this solution on YOUR website!
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the profit equation:
p = r - c
r = revenue
c = cost
x = number calculators bought and sold
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p = r - c
p = 8x - (5.5x + 25)
p = 8x - 5.5x - 25
p = 2.5x - 25
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for a profit of $80:
80 = 2.5x - 25
2.5x = 105
x = 105/2.5
x = 42
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answer:
the store must purchase and sell 42 calculators
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