I get part of the answers right but get at least 2 wrong. can someone break it down for me so i can see where i'm going wrong.

Suppose your VISA card calculates interest using the average daily balance method, and the monthly interest rate is 2.6%. The itemized billing for the month of April is shown below.

Detail	Date	Amount
Unpaid balance	April 1	140
Charge	April 3	1190
Charge	April 11	185
Charge	April 15	350
Payment received	April 28	455
Last day of billing period	April 30
Payment due date	May 7

(a) Find the average daily balance. $1515.17 Correct (b) Find the interest due for this month. $39.39 Correct (c) Find the total balance owed on the last day of the billing period. $1555.56 Incorrect $1449.3943333333 Correct (d) This credit card requires a $20 minimum payment or 1/36 of the amount due, whichever is higher. What is the minimum monthly payment due for this month? $ 43.19 incorrect