C is corrent. Receivables on August sales still outstanding at the end of September are in the 31-to-60-day age group. As a proportion of total receivables, the 31-to-60-day age group represents 170 ÷ 350 = 48.57%.
A is incorrect. This is the proportion of receivables in the 61-to-90-day age group at the end of September. Receivables on July sales still outstanding at the end of September are in the 61-to-90-day age group and represent 100 ÷ 350 = 28.57% of total outstanding receivables at that time.
B is incorrect. This is the proportion of outstanding receivables that are from 0 to 60 days old and that arose from both August and September sales. As a proportion of total receivables, those that are 0 to 60 days old represent (170 + 80) ÷ 350 = 250 ÷ 350 = 71.43%
D is incorrect. This is the proportion of receivables in the 0-to-30-day age group at the end of September incorrectly calculated using 75 instead of 80 as the outstanding receivables. Receivables on September sales still outstanding at the end of September are in the 0-to-30-day age group and represent 75 ÷ 350 = 21.43% of total outstanding receivables at that time.
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