Record the journal entry or entries for each of the following sales transactions. Glow Industries sells 240 strobe lights at $40 per light to a customer on May 9. The cost to Glow is $23 per light. The terms of the sale are 5/15, n/40, invoice dated May 9. On May 13, the customer discovers 50 of the lights are the wrong color and are granted an allowance of $10 per light for the error. On May 21, the customer pays for the lights, less the allowance.