63 is 420% of 15. (63/15 * 100 = 420)
30% off $420 = $420 - (0.3 x $420) = 294
It is: 420-84 = 336
3.5714%
15% of 2,800= 15% * 2800= 0.15 * 2800= 420
It is: 0.15*2800 = 420
Of 63/0.15 = 420
180 600*70% = 420 600-420 = 180
Sale price is $252.00
700-280=420
84 is 20% of 420. If you take 84 off of 420, you get 336. You could also look at it in another way, if you regard 20% as 0.2, then 420 - 0.2 is 419.8.
40% of 420 is 168.