On October 29, Lobo Company began operations by purchasing razors for resale. The razors have a 90-day warranty. 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 $15 and its retail selling price is $70. The company expects warranty costs to equal 8% of dollar sales. The following transactions occurred.

November 11	Sold 60 razors for $4,200 cash.
November 30	Recognized warranty expense related to November sales with an adjusting entry.
December 9	Replaced 12 razors that were returned under the warranty.
December 16	Sold 180 razors for $12,600 cash.
December 29	Replaced 24 razors that were returned under the warranty.
December 31	Recognized warranty expense related to December sales with an adjusting entry.
January 5	Sold 120 razors for $8,400 cash.
January 17	Replaced 29 razors that were returned under the warranty.
January 31	Recognized warranty expense related to January sales with an adjusting entry.

I can not calculate Nov 11, 30th, Dec 9, 16, Dec 29, Dec 31, Jan 5, 17,31. Please help