225 - 30% = 225 x (1 - (30/100)) = 157.5
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67.5
7.5% of 225= 7.5% * 225= 0.075 * 225= 16.875
"30 percent off" means "70 percent on" .70% = 0.70.7 x $130 = $91
Which do you mean - 30% off or 30% of
30 percent of 300 is 90, leaving 210.