Multiple Choice

A project manager is totaling expenses for a marketing campaign: Advertising ($2,500), Printing ($500), and Travel ($1,200). They calculate the sum as ($2,500 + $500) + $1,200, but then realize it is easier to calculate $2,500 + ($500 + $1,200). Which mathematical property ensures that both methods result in the same total?

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Updated 2026-04-03

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