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Lincoln cents still have copper in them, but it's a very small amount only .025 copper & .975 zinc. 1981 is the last year all Lincoln cents were made of mostly copper (.950 & .050 zinc) and then in 1982 the Mint issued Lincoln cents made from both compositions. The copper coins weigh 3.11 grams. The zinc coins weigh 2.5 grams.
US cents minted since mid-1982 weigh 2.5 gm. A US pound is equivalent to 453.6 gm, so rounded to the closest whole number there would be 453.6 / 2.5 = 181 cents in a pound.
.82pounds
56
420 grains