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OpenStudy (anonymous):
Five friends agree to save money for a graduation road trip. They decide that each of them will put $0.25 in the fund on the first day of May, $0.50 on the second day, $0.75 on the third day, and so on. At the end of May, there will be $_____ in their fund. (Hint: There are 31 days in May.)
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OpenStudy (anonymous):
\[5\sum _{n=1}^{31} 0.25 n = 620 \]
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