An American penny weighs 2.5g.
To calculate the number of pennies in 12.5lbs, you first need to convert this value into grams. Since there are 453.592g per pound, 12.5lbs would then equal to 5669.9g (using the equation 453.592 x 12.5). Let's round this up to a nice even number: 5670g.
You then divide 5670g by 2.5g to get the number of pennies in the jar: 2268.
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If you are talking dollars then the answer is 400,000 if you are talking old English pounds then the answer would be 960,000 pennies
Oh, dude, you're really making me do some math here. So, there are about 181 pennies in a pound, which means 25 pounds of pennies would be around 4,525 pennies. If we convert that to dollars, it's $45.25. But hey, who's counting, right?
Assuming that you as referring to US dollars and cents, and that you are referring to pounds avoirdupois as a measure of weight (rather than British Pounds sterling as British currency), the answer depends on when the pennies were produced. Prior to 1982, pennies were 95% copper and 5% zinc, and 147 weighed a pound. Thus, 50 pounds would be worth about $73.50 face value (although the copper value would be perhaps double that). After 1982, pennies were 2.5% copper and 97.5% zinc, and 181 weighed a pound. Thus, 50 pounds would be worth about $90.50 face value. In 1982, both types were produced. 1943 pennies (made of steel coated with zinc) might skew your numbers a bit - 168 weigh a pound, and fifty pounds would be worth about $84.07 face value (although the numismatic value would likely be several times that number). The initial Indian Head pennies (before 1864), Flying Eagle cents, and of course the old Large Cents, would all have different weights than those stated above.
£75.00 (British Pounds) are worth $121.96 in US Dollars (12,196 pennies). If you meant, "how much would 75 lbs in weight of US 1¢ coins be worth", then the answer is $96.07.
A standard roll of pennies contains 50 pennies, which totals 50 cents. To make one million dollars, you would need 2 million pennies. Therefore, you would require 40,000 rolls of pennies (2,000,000 pennies divided by 50 pennies per roll) to reach one million dollars.