SAT Question 28ff3966: Percentages answer and explanation with Desmos solution

Math - Percentages - Percent Increase Decrease Calculate
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A square scale drawing has a side length of inches, and inch on the drawing represents an actual distance of miles. A larger version of the same drawing is printed as a square with the side length longer than the side length of the previous drawing. On the larger drawing, which of the following is closest to the actual distance, in miles, represented by inch?

18
Difficulty:Hard