HW help please. I can't figure out how to calculate some values.

Required A Cash Budget Cash balance beginning Receipts Cash sales $ Collection on accounts receivables Proceeds from loan $ Cotribution from owner 194,400 25,000 25,000 $ Total receipts Less disbursements Payments to vendors Payments for fixed SG&A Payments for variable SG&A Payments of interest Payments of taxes Purchase of equipment 36000 32400 $ 40,000 Total disbursement Net cash flow Required information [The following information applies to the questions displayed below.] Jeremy Slacker started the Del Fuego Surf Shop on January 1 after determining that business school classes conflicted with his preferred activity. He invested $50,000 in the shop,$25,000 of his own savings and $25,000 borrowed from an acquaintance. The loan is to be repaid in 5 years. Jeremy will pay the lender annual interest at a rate of 8 percent. Shortly after opening, Jeremy realized that he is not the best financial planner and has come to you for help. With some prodding, you are able to establish that Jeremy plans to sell only two models of surfboard, the Zuma and the Coronado, for at least the first year. Data on the boards are given as follows. Zuma 480 Coronado 240 Expected annual sales (units) Retail price (per unit) Purchase cost (per unit) $350 250 $650 400 Additional information on the planned operations for the year includes the following. 1. Equipment costing $40,000 was purchased for cash when the store opened. The equipment will be depreciated over five years using straight-line depreciation. 2. Because of the fantastic weather in Del Fuego, Jeremy expects sales to occur uniformly over the year. Sales will be both for cash (60 percent) and on account (40 percent). Sales on account are assumed to be collected in two months. 3. Jeremy will maintain inventory equal to one-half of a month's sales. All boards will be purchased from the manufacturer on credit with payment made one month after purchase. 4. Annual cash selling, general, and administrative expenses are $36,000 fixed plus 10 percent of revenues. 5. Jeremy's tax rate is 40 percent. Required: a. Prepare a cash budget for the year. b. Jeremy wants to ensure that he has cash on hand at the end of the year equal to 150 percent of the current accounts payable balance on December 31. Will he meet that requirement? c. Consider only the assumption about the percentage of sales that will be made on account (currently 40 percent). What percentage would exactly achieve the goal set by Jeremy in requirement (b)