I don't even know where to begin with this problem... please help!!

Henderson's total sales for each month were first calculated in the sales budget and are reflected on the first line of the cash budget. Henderson's sales are made on credit with terms of 2/10, net 30. Henderson's experience is that 25% is collected from customers who take advantage of the discount, 65% is collected in the second month, and the last 10% is collected in the third month after the sale. The budget assumes that there are no bad debts. The cost of materials averages 45% of Henderson's finished product. The purchases are generally made one month in advance of the sale, and Henderson pays its suppliers in 30 days. Accordingly, if July sales are forecasted at $1, 210 million, then purchases during June would be $545 ($1, 210 million x 0.45), and this amount would be paid in July. Other cash expenses include wages and salaries at 17% of sales, monthly rent of $44 million, and other expenses at 5% of sales. Estimated tax payments of $64 million and $67 million are required to be paid on July 15 and October 15, respectively, in addition, a $1, 100 million payment for a new plant must be made in September. Assume that Henderson's targeted cash balance is S300, and the estimated cash on hand on July 1 is $295. Use the preceding information to fill in the missing amounts in the following cash budget. Use the information provided in the budget to complete the following sentences. Henderson Company will be able to invest in short-term marketable securities in some months and will need to borrow to cover cash requirements in others. In the last six months of the year, Henderson will $ to end the year with a cash of S and a cash of $. Henderson Company will want a credit line of at least $ to cover the month with the greatest shortfall, and the financial managers can tell the bank to expect that they will be able to invest up to $ in short-term marketable securities