There is no way! Google wants it that way. You can join Adwords and create a campaign using those keywords and get a general idea of what's being paid, but you'll never get an exact amount. Besides, the amount varies by advertiser and you'll never be able to connect an advertiser with an amount -- unless the advertiser is you.
There is no way.. but you can always estimate Avarage CPC. The equation should be like this.. {Total Earnings - (eCPMx1000)} / Number of Clicks