Buying on account, returning part, paying the rest

Transaction

On May 3 a store bought merchandise on account for $6,000.00. On May 8 it returned damaged goods worth $800.00, and the supplier issued a credit memo. Both were recorded when they occurred. Today it pays the balance it owes the supplier by check. Record today’s payment only.

Assumptions: Perpetual inventory: each sale also records its cost of goods sold. No discount is granted for the payment.