The highest or greatest common factor of 420 and 294 is 42.
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The GCF is 60.
i would have to say 20 i would say
294/420 X100 = 70%
420 / 70 = 6Converting decimal to a percentage: 6 * 100 = 600%
30% off $420 = $420 - (0.3 x $420) = 294