Iron Man Products has projected the following sales for the coming year:

Question

Q1 Q2 Q3 Q4
Sales $ 700 $ 850 $ 950 $ 1,050

Calculate payments to suppliers assuming that Iron Man places orders during each quarter equal to 33 percent of projected sales for the next quarter. Assume that Iron Man pays immediately. The payables period in this case is 0 days.

Q1 Q2 Q3 Q4
Payment of accounts$280 $313 $346 $?

What is the formula to find the answer for quarter 4? My book and sample problem is unclear on it.