Over which of the following intervals is the function 
increasing?
Definitions:
Monthly Base Salary
The fixed amount of money paid to an employee every month, excluding bonuses, benefits, or overtime.
Commission Rate
The percentage or fixed payment associated with a transaction, often used in sales to determine the amount paid to the salesperson or agent.
Gross Earnings
The total amount of money an individual or company makes before any deductions are made.
Weekly Base Salary
The amount of money an employee is paid each week before any deductions or taxes.
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