A shop owner has determined that the relationship between monthly rent charged for store space r (in hundred birr per square meter) and monthly profit 𝑃(𝑟) (in thousands of birr) can be approximated by the function 𝑃(𝑟) = −9𝑟 2 + 8𝑟 + 1. Solve each quadratic equation or inequality. Explain what each answer tells about the relationship between monthly rent and profit for the shop owner?
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