22.9 is 2.9 from 20 and 2.1 from 25, so it is nearer to 25.
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Both,you can put one of them,because they both are closer.
(20 - √229) ≈ 4.867 and (20 + √229) ≈ 35.133
25.4444
25% off of 20 = 15= 25% discount applied to 20= 20 - (25% * 20)= 20 - (0.25 * 20)= 20 - 5= 15
20 % = 0.20; 0.20(25) = 5