0
Anonymous
20 and 50 don't need an estimate. You can perform any operation on them just they way they are.
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They are 20 and 50.
20 + 50 + 20 + 10 = 50 = 150
20% of 50= 20% * 50= 0.2 * 50= 10
1000
10 is 20% of 50 therefore 20% off 50 = 40
-50