That would be a clickthrough rate (CTR) of 5%. The total cost is the amount you paid for all those impressions (if you are bidding CPM) or clicks (if you are bidding CPC).
To bi bilo 5 % razmerje med prikazi in kliki (RPK). Skupna cena pa je znesek, ki ste ga plačali za vse te prikaze (za ponudbo za CNT) ali klike (za ponudbo za CNK).