If the percentage of the sales returned ( the 8%) is missing, how can I find it?

During 2013, its first year of operations, Hollis Industries recorded sales of $10.600,000 and experienced returns of $720,000. Cost of goods sold totaled $6,360,000 (60% of sales). The company estimates that 8% of all sales will be returned. Prepare the year-end adjusting journal entries to account for anticipated sales returns