68% of 40 = 27.2
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170% of 40 = 170% * 40 = 1.7 * 40 = 68
40% off of 68 = 60% of 68 = 68*60/100 = 40.8
(68/170) x 100 = 40%
50%=340 so if 10% is 68 then 340-68 = 50%-10%=40%=272 (answer=272)
0.4 X = 34X = 34/0.40.68 X = 0.68 (34/0.4) = 57.8===============================Better way:40/34 = 68/X40X = (34 x 68)X = (34 x 68) / 40 = 57.8