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70% of 80 = 80*70/100 = 56/100 or 14/25
70 + 80 + 70 + 30+ 80 + 80+ 80 = 490
70 and 80 is 150.
80 - 70% = 80 x (1 - (70/100)) = 24
70% of 80 is 56.