To calculate the total surface area of Kym’s sawhorse, we can consider it as a rectangular prism. A rectangular prism has dimensions of length, width, and height. The total surface area \( A \) can be calculated using the formula:
\[ A = 2(lw + lh + wh) \]
Where:
- \( l \) is the length (27 inches)
- \( w \) is the width (19 inches)
- \( h \) is the height (39 inches)
Let's plug in the values:
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Calculate \( lw \): \[ lw = 27 \times 19 = 513 \]
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Calculate \( lh \): \[ lh = 27 \times 39 = 1053 \]
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Calculate \( wh \): \[ wh = 19 \times 39 = 741 \]
Now, summing these areas together:
\[ lw + lh + wh = 513 + 1053 + 741 = 2307 \]
Now, multiply by 2 to get the total surface area:
\[ A = 2 \times 2307 = 4614 \text{ square inches} \]
Thus, the total surface area of Kym's sawhorse is
\[ \boxed{4614} \text{ in}^2. \]
(There is no need for rounding as the result is already a whole number.)