How can I solve for the number of days, Unpaid balance and daily balance?

1 Chapter 11 - Quiz 01 2 Your revolving account is charged 21% APR. The finance charge is computed using the 3 average daily balance. Compute the new balance. 4 5 Billing cycle April 1-30 APR 21% 6 Previous Balance on Apr. 1 $631.21 Monthly Rate 1.75% 7 Charge on Apr. 5 $42.00 8 Charge on Apr. 15 $68.13 9 Payment on Apr. 21 $300.00 10 Number Unpaid Daily Activity Dates 11 of Days Balance Balance 12 Previous Balance 1-Apr 13 Charge 5-Apr 14 Charge 15-Apr 15 Payment 21-Apr 16 Total 1-May 17 Average Daily Balance 18 Finance Charge 19 New Balance 20 21 Directions