Power usage is measured in kilowatt-hours, kWh. After 7 a. m., the power usage on a college campus increases at a rate of 21% per hour. Prior to 7 a. m., 15,040 kWh have been used. The university has a daily goal to keep their power usage less than or equal to 100,000 kWh. Which inequality can be used to determine the number of hours, t, after 7 a. m. when the power usage on campus will be less than or equal to 100,000?