The Greatest Common Factor of 100, 120, 220: 20
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The GCF is 30.
120/200 * 100 = 60% =====
sqrt(120)factor under the radicalsqrt(22 * 30)= 2sqrt(30)=========
100
If you got 20% discount then you paid 80% of the full price. If 120 is 80% then 100% is 150 ie 120 x 100/80