The beginning balance of keyshawn's savings account for the month of september was $3900, and it remained this way for the first 11 days of the month. on september 12, keyshawn made a withdrawal of $700, so his balance changed, and it remained the same for a total of 9 days. on september 20, keyshawn made a deposit of $1500, so his balance changed again, and it remained the same for a total of 10 days to finish out the month. keyshawn's savings account has an apr of 3.65%, calculates interest daily, and pays interest at the end of the month. keyshawn wants to calculate the amount he earned in interest during the month of september.
part i: what interest rate does keyshawn's savings account pay per day?
part ii: how much did keyshawn earn in interest during the first 11 days of september?
part iii: how much did keyshawn earn in interest during the next 9 days of september?
part iv: how much did keyshawn earn in interest during the last 10 days of september?
part v: how much did keyshawn earn in interest during the month of september?