a tire dealer sells 2 tires for as much as he paid for 3 tires. he paid 240 for a dozen tires. what is the total profit on 12 tires?
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x = cost to the dealer of 1 tire
selling price =3x/2
In the 12 tires deal he paid 240/12=20 for one tire. That's equal = x
His selling price is 3x/2=3*20/2=30
Profit for one tire: 30-20=10
Profit for 12 tires: 12*10=120
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