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Mathematics

P=100h-2000

Mia's law firm has $2000 worth of expenses each month. Her firm charges $100 per hour for legal advice. The given equation shows the firm's profit, Pafter being paid for h hours of legal advice during a one-month period. What is the minimum number of hours of legal advice that Mia's firm must be paid for during one month in order to cover the firm's monthly expenses?