Hi LUANDATO,

In this question, we're looking for the categories in which the TOTAL imports and exports are at least $75 million. The math involved is really just arithmetic, but we have to make sure that we keep careful track of each category. There is a minor 'shortcut' in this question though - between the two pie charts, there is a total of $300 million; [spoiler]you might notice after your first two calculations that there's not enough money left for either of the final 2 categories to total $75 million.[/spoiler]

Autos: (50% of $200 mill) + (10% of $100 mill) = $110 million
Textiles: (30% of $200 mill) + (20% of $100 mill) = $80 million
Food: (5% of $200 mill) + (40% of $100 mill) = $50 million
Tech: (15% of $200 mill) + (30% of $100 mill) = $60 million

Final Answer: B

GMAT assassins aren't born, they're made,
Rich