I got both these numbers wrong but the journals correct

On October 29, 2016, Lobo Co. began operations by purchasing razors for resale. Lobo uses the perpetual inventory method. The razors have a 90-day warranty that requires the company to replace any nonworking razor. When a razor is returned, the company discards it and mails a new one from Merchandise Inventory to the customer. The company's cost per new razor is $16 and its retail selling price is $80 in both 2016 and 2017. The manufacturer has advised the company to expect warranty costs to equal 7% of dollar sales. The following transactions and events occurred. 2016 Nov. 11 Sold 60 razors for $4,800 cash. 30 Recognized warranty expense related to November sales with an adjusting entry. Dec. 9 Replaced 12 razors that were returned under the warranty. 16 Sold 180 razors for $14,400 cash. 29 Replaced 24 razors that were returned under the warranty. 31 Recognized warranty expense related to December sales with an adjusting entry. 2017 Jan. 5 Sold 120 razors for $9,600 cash. 17 Replaced 29 razors that were returned under the warranty. 31 Recognized warranty expense related to January sales with an adjusting entry. Problem 11-4A Part 4 1. What is the balance of the Estimated Warranty Liability account as of December 31, 2016? Estimated warranty liability balance $ 672 5. What is the balance of the Estimated Warranty Liability account as of January 31, 2017? Estimated warranty liability balance $ 880