Give the step-by-step reasoning process and then the final answer. On a construction site, the Laker cement factory provided 500 bags of cement sold to Mr. Zander at $10 per bag. Mr. Zander also received twenty lorries of construction sand, each carrying 10 tons of sand, sold at $40 per ton. How much money did Mr. Zander pay for these construction materials?
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The total cost for the sand is 500 * 10 = $5000. Since each lorry was carrying 10 tons of sand, the twenty lorries carried 20 * 10 = 200 tons. At $40 per ton, Mr. Zander paid 200 * $40 = $8000 for the sand that was delivered to his construction site. Altogether, Mr. Zander paid $8000 + $5000 = $13000 for the delivered construction materials.
The final answer: 13000.
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