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?

Step 1: Determine the cost of each tire. The dealer paid $240 for 12 tires, so each tire costs$240/12 = $20.

Step 2: Determine the selling price of each tire. The dealer sells 2 tires for as much as he paid for 3 tires. So, the selling price of each tire is the cost of 3 tires divided by 2, which is $20*3/2 =$30.

Step 3: Determine the total selling price for 12 tires. This is the selling price of each tire multiplied by the number of tires, which is $30*12 =$360.

Step 4: Determine the total profit. This is the total selling price minus the total cost, which is $360 -$240 = $120.

So, the total profit on 12 tires is $120.