Oakley Wholesale Hardware and Supplies (OWHS) sells tools, lumber, and other remodeling supplies to commercial contractors. The company controller is compiling cash and other budget information for July, August, and September. On June 30, the company had inventories valued at $462,500.

For budgeting and inventory planning, the company has developed a standard unit of inventory. Each inventory unit has a purchase price from vendors of $25, which is not expected to change in the next three months.

The budget is based on the following assumptions:

1. Each month's sales are billed on the last day of the month.
2. Customers are allowed a 3 percent discount if payment is made within 10 days after the billing date.
3. Receivables are recorded at their gross amounts.

Billings are collected as follows:
- 75 percent within the discount period
- 15 percent by the end of the month
- 8 percent by the end of the following month
- 2 percent is uncollectible

Additional information:
- 70 percent of both inventory purchases and selling, general, and administrative expenses are paid in the month purchased, with the remainder paid in the following month.
- The number of units in each month's ending inventory equals 90 percent of the next month's units of sales.
- Selling, general, and administrative expenses, including $8,000 of depreciation, equal 20 percent of the current month's sales.

Questions:
a. What is the percentage of sales collected within the discount period?
b. What is the percentage of sales collected by the end of the month?
c. What is the percentage of sales collected by the end of the following month?
d. What percentage of sales is uncollectible?