Question
Peter went to a shopping centre with 4 ten-dollar notes. He bought a stapler and a mug. A stapler cost 2 times as much as a mug. He received $37.30 change. How much did the mug cost?
4 m

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Peter went to a shopping centre with 4 ten-dollar notes. He bought a stapler and a mug. A stapler cost 2 times as much as a mug. He received $37.30 change. How much did the mug cost?