Jessica and her friends run a lawn mowing and landscaping business every summer to earn extra spending money. Jessica’s total monthly expenses are $300 a month. On average, she charges $25 to mow a yard and $50 per yard for landscaping work. Her monthly profit goal is to earn at least $500 a month. Let m represent the number of yards mowed and a represent the number of yards landscaped each month. Which inequality represents this situation?