Bryan owns a landscaping business. He charges $40 per square foot for retaining walls. Bryan’s monthly expenses to run the business total $24,000. He wants to earn at least $4,000 per month. First, letting w be the number of square feet of retaining wall, write an inequality to model this situation. Then, determine how many total square feet of retaining wall Bryan must build to earn a profit of at least $4,000 per month. (Round your answer to the nearest whole number.)

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