Answer:
($1391.78)
Explanation:
According to the problem, computation of the given data are as follows,
Sales = $4,500,000  	
COG sold = $3,248,000
First we calculate the amount receivable in both 40 and 43 days, then 
Amount Receivable = Sale ( Receivable days ÷ 365)	
Amount Receivable (40 days) = $4,500,000 ( 40 ÷ 365) = $493,150.68	
Amount Receivable (43 days) = $4,500,000 ( 43 ÷ 365) = $530,136.99	
So, change in receivables = $530,136.99 - $493,150.68 
= $36,986.30
Now we calculate the inventory for both 119 and 115 days
Inventory = COG Sold ( Inventory Days ÷ 365)	
Inventory (119 Days) = $3,248,000 ( 119 ÷ 365) = $1,058,936.99	
Inventory (115 Days) = $3,248,000 ( 115 ÷ 365) = $1,023,342.47	
So, change in inventory = $1,058,936.99-$1,023,342.47 
= $35,594.51
So, we can calculate the cashflow effect by using following formula,
Cashflow change = Change in inventory - Change in receivables
By putting the value, we get
Cashflow change = $35,594.51 - $36,986.30
=  ($1391.78)	(Bracket denotes negative)