You can check here
https://etherscan.io/At the moment: DIFFICULTY 4,805.04 TH || HASH RATE 384,437.60 GH/s
Average block time = DIFFICULTY : HASH RATE = 12.5 s
Your hash rate = 720 MH/s
So you can get 720 MH/s : 384,437.60 GH/s = 0.000187%
Average block reward = 5 ETH = $9,000 (1ETH ~ $1,800)
You can get 0.000187% from 9000 USD = $0.017 per 12.5 s = $116.3 per day
Price for Innosilicon A10 Pro = $4,388.00.
If you don't pay your electricity bill, you will recover capital after: 38 days
A great trading plan, hope I don't go wrong somewhere.