Route Canal Shipping Company has the following schedule for aging of accounts receivable:

Age of Receivables April 30, 20X1
(1)	(2)	(3)		(4)
Month of Sales	Age of Account	Amounts		Percent of Amount Due
April	030	$	282,240	_______
March	3160		105,840	_______
February	6190		246,960	_______
January	91120		70,560	_______
Total receivables		$	705,600	100%

a. Calculate the percentage of amount due for each month.

month of sales	percent of amount due
april
march
feb
january
total receivable	100%

b. If the firm had $1,728,000 in credit sales over the four-month period, compute the average collection period. Average daily credit sales should be based on a 120-day period.

average collection period-?