To find the number of acres of old-growth trees in the forest, we can calculate 0.3% of 51,000 acres.
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Convert the percentage to a decimal: \( 0.3% = \frac{0.3}{100} = 0.003 \)
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Multiply this decimal by the total number of acres: \[ \text{Old-growth trees} = 51,000 \times 0.003 = 153 \]
Therefore, there are 153 acres of old-growth trees.