SOLUTION: A telephone company offers you an opportunity to sell prepaid, 30 minute long-distance phone cards. You will have to pay the company a one-time set-up fee of $200. Each phone card

Question 585030: A telephone company offers you an opportunity to sell prepaid, 30 minute long-distance phone cards. You will have to pay the company a one-time set-up fee of $200. Each phone card will cost you $5.70. How many cards would you have to sell before your average total cost per card falls to $8?
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
y=mx+b
y=mx+200
y=5.70x+200
8x=5.7x+200
2.3x=200
x=86.95
so you have to sell 87 cards to get the average cost down to 8 dollars each

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