40% off = 60% left.
60% of 60 pounds = 60*60/100 = 36 pounds
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So: 60 % remaining 60 % = 60 / 100 = 0.6, 0.6 * 20 = 12 pounds
40% off of 68 = 60% of 68 = 68*60/100 = 40.8
40% off 150 is 60% of 150 = 150*60/100 = 90
60% off 699 = 40% of 699 = 699*40/100 = 279.6
60% off 75.00 = 40% of 75.00 = 75.00*40/100 = 30.00