Answer:
Cash Collections from customers = $60,000
Cash paid to suppliers = $33,000
Explanation:
Given:
Accounts Receivable, Jan  1 = $13,000
Accounts Receivable, Dec 31 = $9,000
Accounts Payable, Jan 1 = $4,000
Accounts Payable Dec. 31 = $7,000
Merchandise Inventory, Jan 1 = $10,000
Merchandise Inventory, Dec. 31 = $15,000
Sales = $56,000
Cost of Goods Sold = $31,000
Now, 
Cash Collections from customers 
= Accounts Receivable, Jan  1 + Sales - Accounts Receivable, Dec. 31 
= $13,000 + $56,000 - $9,000 
= $60,000
also,
Purchase 
= Merchandise Inventory, Dec. 31 + Cost of Goods Sold - Merchandise Inventory, Jan 1
= $15,000 + $31,000 - $10,000 
= $36,000
and,
Cash paid to suppliers 
= Accounts Payable, Jan 1 + Purchase - Accounts Payable Dec. 31 
= $4,000 + $36,000 - $7,000 
= $33,000