Question

Four friends a 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
S- in their fund. (Hint: There are 31 days in May.)

Answer 1

$147.25

0.25 is the interval add to all the days

after add them and multiply by 4