Use the following information to calculate the ending balance of the allowance account using the aging of accounts receivable method.

Aging group	Amount	Percent uncollectible
0-30 days	3,800,000	1%
31-60 days	1,200,000	5%
61-90 days	890,000	12%
91+ days	550,000	28%

Select one:

a. 740,600

b. 648,600

c. 358,800

d. 550,000