To calculate the total amount Alberto paid, we need to find both the cost of the bat and the cost of the ping pong balls.
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Cost of the bat: \[ \text{Cost of bat} = $15 \]
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Cost of the ping pong balls: Since the pack contains 6 ping pong balls and each costs 50 cents (or 0.50 dollars), we can calculate the cost of the ping pong balls as follows: \[ \text{Cost of ping pong balls} = 6 \times 0.50 = $3.00 \]
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Total cost: Now, we add the cost of the bat and the cost of the ping pong balls together: \[ \text{Total cost} = \text{Cost of bat} + \text{Cost of ping pong balls} = 15 + 3 = $18 \]
Therefore, the total amount Alberto paid is $18.