The deck is 30*40=<<30*40=1200>>1200 square feet

He pays 3+1=$<<3+1=4>>4 per square foot

So he paid 1200*4=$<<1200*4=4800>>4800

# Answer

4800
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
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?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
4800
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?
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