Identify each of the following activities as operating $($O$),$ investing $($I$),$ or financing $($F$)$:

Payment of employee salaries

Answer $1$

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Issuance of common stock

Answer $2$

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Purchase of equipment to manufacture a company$$s products

Answer $3$

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Repayment of a loan

Answer $4$

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Investment of excess cash in the shares of another company

Answer $5$

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Sale of merchandise inventory