$997.9 = 55 lb * 453.6 g/lb * (1/2.5 dimes/gram) * .10 dollars per dime 2.5 grams per dime is when they are new; a little less when worn, but maybe not too much less.
2.5 grams less 4% loss for circulation. 1 pound is 453.592 grams...189 dimes per pound x 55lb 10,394 dimes. What's the prize for the closest guess? If I'm off it's because you didn't account for the bag and your scale is past the calibration date :D :D