Answer: The amount paid for 15 food booths for d days is:
15×(100+5d).
The amount paid for 20 game booths for d days is:
20×(50+7d).
The total amount is:
15(100+5d)+20(50+7d)=1500+75d+1000+140d=1500+1000+140d+75d=2500+215d
Explanation:
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