CPA or CPC on AdWords for UK app DL's on Google Play?

[bluedot]

Hey guys, I want to promote my app on GP through AdWords in UK only. I started with setting some demographics options (sex, age, interests), OS versions etc. and I set the CPC at 0.05 USD per click. That produced exactly 11 impressions in 24hrs.

Now, I've switched to CPA bidding and my bid is at 0.70 USD.

I don't know what to expect yet, but I wonder, if you advertise in UK via AdWords, what are your typical bids?

Thanks.