Why is this wrong, please correct me wrong, thanks

Ponzi Products produced 100 chain-letter kits this quarter, resulting in a total cash outlay of $10 per unit. It will sell 50 of the kits next quarter at a price of $11, and the other 50 kits in the third quarter at a price of $12. It takes a full quarter for Ponzi to collect its bills from its customers. (Ignore possible sales in earlier or later quarters.) (Negative amount should be indicated by a minus sign.) Required: a. What is the net income for Ponzi next quarter? b. What are the cash flows for the company this quarter? c. What are the cash flows for the company in the third quarter? d. What is Ponzi's net working capital in the next quarter? Answer is complete but not entirely correct. a. 50 $ $ b Net income in next quarter Cash flow in this quarter Cash flow in third quarter Net working capital in next quarter c. $ (1,000) 550 600 d. $