Auction prize offering

Can a small business expense a prize they give to a non-profit organization running an auction to raise funds for the non-profit? If so, in what percentage or the whole amount of the prize as established by the business?

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Business expenses must be ordinary and necessary to be deductible. Advertising expenses directly related to the business are deductible including those that promote goodwill to the public such as sponsorships of local causes. https://www.irs.gov/newsroom/small-business-advertising-and-marketing-costs-may-be-tax-deductible

A charitable contribution would be deducted on Form 1040, Schedule A if there was no quid pro quo (ie given without expectation of something in return).