Several countries use the word 'penny' for one of their coins - some Americans refer to the one cent coin as a penny. So I don't know which currency you are referring to. Also, the thickness of these different coins would be different in each country, so my best advice is to measure a few different piles of ten coins as accurately as you can and take an average of them and then multiply the result by 100,000. That will be very close to the actual height of i,000,000. The reason you use a few different piles is to allow for the fact that older coins will be a bit thinner from having been in use.
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61,023.622 inches = 5,085.302 feet = 0.96 miles
1.5 million pennies = $15,000 1 million pennies = $10,000 .5 million pennies = $5,000
1.55mm per penny X 100,000,000 cents = 155,000,000mm tall or 155 kilometers.
100 pennies = $1.00 100 pennies X 1,000,000 = 100,000,000 pennies.
1 hundred pennies = 1 dollar 8 hundred million pennies = 8 million dollars