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.
According to the U.S. Bureau of Labor Statistics (BLS), the mean annual wage for travel agents was $37,200 as of May 2013 (www.bls.gov). Workers in the bottom 10% made $19,640 or less, and those in the top 10% earned $57,910 or more.