Suppose Amazon.com sells 1,000 books on account for \($10\) each (cost of these books is \($6,000).\) One hundred of these books (cost, \($600)\) were damaged in shipment, so Amazon later received the damaged goods as sales returns. Then the customer paid the balance within the discount period. Credit terms were 2/15, net 30.

Journalize Amazon's

(a) sale,

(b) sale return,

(c) cash collection transactions.