1 converts written data into sound waves. 2  converts the sound waves from a voice into a digital signal. 3  converts letters from the keyboard into digital format. 4  converts digital sound waves into analog sound waves.
Travel agencies make their money in a variety of ways. The products agents sell have built-in fees that result in a profit for the agency. The amount of the fees and the ways in which they are earned and distributed differ by the type of product sold and the suppliers who provide that product to the agency.
The average travel agent earned $35,740 in 2011, according to the U.S. Bureau of Labor Statistics. Ten percent of agents earn $54,640 per year or more. Out of 67,490 agents nationwide, 63,500 worked for travel agencies and reservations services, with average annual pay of $35,490. Agents working in corporate travel offices earned a much-higher average of $47,300 per year. The state with the highest employment in 2011 was California, where 8,870 agents averaged $38,880 per year. The highest-paying state was Maryland, where annual pay averaged $43,270.