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The British One Pound coin is 3.15mm thick, so 317 or 318 coins should make a metre high stack.
A single US 1 dollar bill is approximately 0.0043 inches thick. Therefore, a stack of 1 million US 1 dollar bills would be 4,300 inches tall, which is equivalent to 358.33 feet or about 109.24 meters.
12 x 3 / 4 = 9 The stack of 12 boards would be 9 inches high.
12 x 3 / 4 = 9 The stack is 9 inches high.
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