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Paul has $20 to buy either 5 erasers and 30 pencils or 10 erasers and 24 pencils. Each eraser cost $0.30 and each pencil cost $0.60. How much will each option cost? How much change will he get back after buying each option?

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A - (5 * 0.3) + (30 * 0.6)

B - (10 * 0.3) * (24 * 0.6)

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