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I don't understand the last test

I don't understand the last test. If I do the calculation myself I have 57 and not 56... :/

0.5*4 = 2 (10+10+10+30)/100 = 0.6 120 - 60 - (2+0.6) = 57.4 =>57

Created: Nov. 8, 2012, 6:34 p.m.
Updated: Sept. 30, 2013, 1:46 p.m.
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Barti