Answer:
Journal entry to record sale of toasters and warranty
Dr Cash 36,000
Cr Sales revenue 36,000
Dr Warranty expense 2,400
Cr Warranty liability 2,400
Adjusting entry for actual warranty expense
Dr Warranty liability 500
Cr Cash 500
Since the warranty covers a 5 year period, the remaining warranty expense cannot be recognized as warranty revenue yet. Only after the warranty period is over, will any money left over will be recognized as revenue.