Can someone help me solve this problems a-d. Thank you

I need to see all the calculations

Lakewood Laser SkinCare's ending cash balance as of January 31, 2015 (the end of its fiscal year 2014) was $15,000 Its expected cash collections and payments for the next six months are given in the following table a. Caleulate the firm's expected ending cash balanee for each month. b. Assuming that the firm must maintain an ending cash balance of at least $12.000, how much must they borrow during each month? c If the firm must pay 5% annual interest on its short-term borrowing. what are your ending cash balances for each month? d. What are the ending cash balances if the firm uses any cash in excess of the minimum to pay off its short-term borrowing in each month