Cool Water, Inc. sells bottled water. The firm keeps in inventory plastic bottles at $10\%$ of the monthly projected sales. These plastic bottles cost $$0\mathrm{.}005$ each. The monthly sales for the coming year are as follows:

Show the anticipated cost of plastic bottles each month for these projected sales, the beginning inventory volume and ending inventory volume each month, and the monthly increase or decrease in cash flow for inventory given that an increase is a use of cash and a decrease is a source of cash.

What is the beginning inventory balance in May?