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The correct function rule for the cost of n pounds of strawberries is:
y = 0.75n - 0.40
To find the cost of 20 pounds of strawberries, substitute n = 20 into the function:
y = 0.75(20) - 0.40 = 15 - 0.40 = $14.60
Therefore, 20 pounds of strawberries would cost $14.60.