An unpleasant surprise

my new car has XM Radio--but only for a limited time, I discovered in yesterday's mail. I get three months free, then it costs $12.95 a month.

How would I like to be billed--$45.00 for three months, or yadayada. This kind of math makes me nuts. Three times $12.95 is not $45.00! Trivial, I know, but how can you run a radio station and not be able to multiply 3x12.95? They should not have allowed XM and Sirius to merge.

It reminds me of my Verizon account--$99.00 a month, adding up to a total of $150; or ATT--$30.00 a month per line (I have 2), which adds up to $90 and change.