This is not a very GMAT-like question, but according to the first graph, the company's revenue increased every year (that graph indicates percent growth in revenue, and all the values are positive), so revenue was highest in 2003. The second graph shows us what % of revenue was paid in tax. The company's tax rate was also highest in 2003 from the second graph (tied with 2001), so if they had the highest tax rate that year and also the greatest revenue that year, that must have been the year when they paid the most tax. There's no need to do any calculation.

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