Answer:
Dr Warranty expense $22,050
Cr Warranty expense liability $22,050
Step-by-step explanation:
Warranty expense is a liability that may be incurred by a business or firm due to the outcome of an unpredictable future events. It is a contingent liability 
Given that ;
Current sales = $315,000
Warranty expense = $22,050 (7% of $315,000) 
As a rule in accounting, debit increases assets and expenses while credit reduces assets and expenses.
Also, credit increases stock, sales revenue and liabilities while debit reduces them. 
The entry is;
Dr Warranty expense $22,050
Dr Warranty expense liability $22,050