Requirement $4.$ Assume Flashy Glasses pays its employees hourly under the original pay structure but is able to pay the mall $7\%$ of its monthly revenue instead of monthly rent. At what sales levels would Flashy Glasses prefer to pay a fixed amount of monthly rent, and at what sales levels would it prefer to pay $7\%$ of its monthly revenue as rent? $($Round intermediary calculations to the nearest cent and your answer up to the nearest whole unit.$)$