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Mathematics 8 Online
OpenStudy (anonymous):

Fivree 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.) @Mathematics

OpenStudy (lilg132):

620

OpenStudy (lilg132):

\[5\sum_{n=1}^{31}0.25n=620\]

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