20 pounds to troy ounces?

First, know the difference between troy pound and the regular every day avoirdupois pound that is used in all US and British systems other than precious metal calculation.

1 avoirdupois pound (lb) = 453.6 grams

1 troy pound (troy lb) = 373.2 grams

Second, 20 lbs * 453.6 grams/lb = 9072 grams

Third, 9072 grams divided by 31.10135 grams/troy ounce = 291.7 troy ounces

Thus 20 lb = 291.7 troy ounces

EXTRA CREDIT: 1 troy pound = 12 troy ounces

so 291.7 troy ounces divided by 12 troy ounces/1 troy pound = 24.3083 troy pounds

THUS..... 20 avoirdupois lb = 291.7 troy ounces = 24.3083 troy pounds

291.7 troy ounces @ $1136.85 USD per TROY Oz.= $331619.145 USD