Reconstruct a question, answer pair from this explanation: The deck is 30 * 40 = 1200 square feet. He pays 3 + 1 = $4 per square foot. So he paid 1200 * 4 = $4800.
Q:Mark constructed a deck that was 30 feet by 40 feet. It cost $3 per square foot. He then paid an extra $1 per square foot for sealant. How much did he pay?
A:4800