Budgeted sales of the South Side Sundae Shop for the first quarter of next year are as follows: January February March $40,000 45,000 50,000 Purchases averages 60 percent of sales revenue and management desires ending inventories equal to 20 percent of the following month's sales. Assuming the January 1 inventory is $8,000, the January purchases budget is: a. $20,000 O b. $25,000 O c. $15,250 d. $28,000