So: 60 % remaining
60 % = 60 / 100 = 0.6, 0.6 * 20 = 12 pounds
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40% off = 60% left. 60% of 60 pounds = 60*60/100 = 36 pounds
40% of 50 = 20
40 percent of 50 = $20
40% off would give you a new total of 150.
10 is 20% of 50 therefore 20% off 50 = 40