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b) 2 1/2 x ( 0,15 + 8/15 * 1/4)- 5/24 = 2 1/2 x (15/100 + 8/60) - 5/24 = 2 1/2 x (45/300 +40/300) - 5/24= 2 1/2 x 95/300 - 5/24 = 95/120 - 5/24 = 19/24 - 5/24 = 14/24