Shell Programming and Scripting

Seems like can use awk and perl command. But I don't have the idea to write the command line. Thanks for all of your advise.
For example, if I have the file whose content are:
Sample 1. ATAGCAGAGGGAGTGAAGAGGTGGTGGGAGGGAGCT
Sample 2. ACTTTTATTTGAATGTAATATTTGGGACAATTATTC
Sample 3. AAATCATGGTGGGTTTATTGATGGTTAGAAAGTTCC
All the sample above, got 36 nucleotide.

I want my output to count the G + C and GC %. So my output should look like this:
Sample 1: G+C = 21 GC%= 58.33%
Sample 2: G+C = 8 GC%=22.22%
Sample 3: G+C = 13 GC%=36.11%

Thanks and appreciate of your answer.

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