Answer:
a) Ponzi Products
Income statement
For quarters 1, 2, 3 and 4 of year 202x
                                        Q1                     Q2                  Q3                Q4
Sales revenue                $0                   $550             $600              $0
COGS                              $0                   $500             $500              $0
Operating income          $0                    $50               $100              $0 
Since no products are sold during the first and fourth quarter, their respective revenues, COGS and operating income is $0. 
b) Ponzi Products
Schedule of Expected Cash Receipts
For quarters 1, 2, 3 and 4 of year 202x
                                        Q1                     Q2                  Q3                Q4
Sales revenue                $0                    $0                $550            $600
Cost of goods man.  ($1,000)                $0                   $0               $0
Net cash receipts     ($1,000)                 $0                $550            $600 
c) This question is incomplete, it should say what is Ponzi's net working capital for each quarter?
NWC = current assets - current liabilities
NWC Q1 = $1,000 (Merchandise inventory account, no liabilities)
NWC Q2 = $500 (Merchandise inventory account, no liabilities)
NWC Q3 = $550 (Cash account, no liabilities)
NWC Q4 = $1,150 (Cash account, no liabilities)