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To solve this problem, we can set up a proportion using the given ratios:
3 tablespoons of kernels = 12 cups of butter
10 tablespoons of kernels = x cups of butter (what we need to find)
We can cross multiply and solve for x:
3 * x = 10 * 12
3x = 120
x = 120 / 3
x ≈ 40
So, Jennie needs approximately 40 cups of butter. However, the answer choices are rounded to the nearest hundredth, so we need to round 40 to the nearest hundredth, which is 40.00.
Therefore, the answer is 40.00.