Technology Trina Jones is considering purchasing cellular phone PDAs for her employees. She wants to determine the yearly cost for each type of PDA. PDA 1 costs $300 and has a monthly charge of $65. PDA 2 costs $225 and has a monthly charge of $85. PDA 3 costs $100 and has a monthly charge of $105. Use spreadsheet software to answer the following questions.

a. What would be the total annual cost for each PDA?

b. Assume Trina’s employees will use the PDAs for two years at the same monthly cost. Which PDA is the least expensive over two years?