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.)

Question

anonymous · Answer

They will have 
$$$\sum_{i=1}^{31}(0.25i)$$
By the end of May, which by summation expansion totals
$$$0.25*\frac{1}{2}(31)(31+1)=$124.00$$

anonymous · Answer

forgot there are 5 people? or did u include that