I really dont understand about Google Adwords, can anyone help me???

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pls , guys explain it to me about google adwords.. Account snapshot it says there "payment accepted" ($55.89) whats the meaning of that?? And the other side Campaign Performance "total cost"($156.00) What does it mean?? I really dont know did I really earn??? Pls anyone, need your explanation... Im just a Newbie in Google Adwords and to my stupidness i use my dad's credit card :D Plss anyone help me..