2170
30% off of 3100
= 30% less applied to 3100
= 3100 - (30% * 3100)
= 3100 - (0.30 * 3100)
= 3100 - 930
= 2170
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60 - (30%) = 42
199 - (30%) = 139.3
34.50 - (30%) = 24.15
90 minus 30 percent - and therefore 30 percent OFF the number, is equal to 90 x (1 - (30 / 100)) = 90 x (1 - 0.3) = 90 x 0.7 = 63. 30 percent OF 90 is equal to 90 x (30 / 100) = 90 x 0.3 = 27
120 - 75% = 25% of 120 = 120*25/100 = 30