Write the sum with summation notation. Do not calculate the sum. 
Definitions:
Journal Entries
The method by which transactions are entered into an accounting system, typically involving a debit to one or more accounts and a credit to another.
Warranty on Parts
A guarantee provided by a manufacturer or seller regarding the condition of parts or components and their performance over a specified period.
Defective Units
Defective units refer to products that fail to meet quality standards or specifications and are therefore unsuitable for sale or use.
Current Ratio
An indicator assessing the ability of a company to cover its obligations or debts falling due within one year.
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