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15 pounds is 15 pounds!
For "avoirdupois" pounds and ounces, the correct value is 16 and 15 is most nearly accurate. For "troy" pounds and ounces, the correct value is 12 and 10 is most nearly accurate.
15% off 115 pounds = 115 pounds - (0.15 x 115 pounds) = 97.75 pounds
70% of 15 pounds = 10.5 pounds
2.1 pounds is 15% 0f 14 pounds.