Excel matrix math help

Long distance plans: you are chosing between two monthly long distance phone plans offered by two different companies. Company A charges $0.05 per minute for in state calls, $0.12 per minute for state to state  calls, and $.30 per minute for international calls. Company B

  charges $0.085 per minute for in state calls, $0.10per minute for state to state  calls, and $.25 per minute for international calls. In a month you normally use 20 minutes on in state calls, 60 minutes on state to state calls and 30 minutes on international calls.

Use excel to set up a matrix C that represents the charges for each type of call by each company.

Be sure to use headings to identfy each row and column.

State what each entry of the matrix represents.

Set up matrix T that represents the times spent on the phone for each type of call.

State what each entry of the matrix represents.

Find the product TC and state what each entry of the matrix represents.

Which company should you choose?