A construction engineering company needs to purchase 1,000 sheets of steel. Which option is the most cost-effective way to purchase them?

Calculate the total cost of buying 1,000 sheets with each option. Option A costs 10 × $500 = $5,000, and option B costs 5 × $1,000 = $5,000. Option C costs 2 × $1,500 = $3,000, while option D costs $3,500. Therefore, buying 500 sheets at a time for $1,500 is the most cost-effective choice.

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