(I especially need help with the bold part at the end)

Grenoble Enterprises had sales of $50,000 in March and $60,000 in April. Assume Grenoble used a variety of different revenue and cost forecast approaches and as a result, sales for May, June, and July are forecasted to be $70,000, $80,000, and $100,000, respectively. The firm has a cash balance of $5,000 on May 1 and wishes to maintain a minimum cash balance of$5,000. Given the following data, prepare a schedule showing the forecasted cash receipts(cash revenues) and cash disbursements(cash expenses) for May, June, and July. The firm makes 20% of sales for cash, 60% are collected in the next month, and the remaining 20% are collected in the second month following sale.

1. The firm receives other income of $2,000 per month.
2. The firms actual or expected purchases, all made for cash, are $50,000, $70,000, and $80,000 for the months of May through July, respectively.
3. Rent is $3,000 per month.
4. Wages and salaries are 10% of the previous months sales.
5. Cash dividends of $3,000 will be paid in June.
6. Payment of principal and interest of $4,000 is due in June.
7. A cash purchase of equipment costing $6,000 is scheduled in July.
8. Taxes of $6,000 are due in June.

1. Add the estimated expenses to the exercises to arrive at net cash for each forecasted month.
2. Any net cash above the minimum cash requirement will be invested into marketable securities.
3. Any net cash less than $5,000 will be borrowed from a bank in the form of a notes payable (promissory note). Ignore interest related to the notes.
4. Set up a document/schedule disclosing all cash receipts less cash payments to arrive at net cash for each of the forecasted months.