If i invest 7000$ to mine, like. The TerraMiner
It makes about 1.1btc/day so i can get 350$(@themoment)x 21(days) that estamated 7500$
So three weeks i can make the machines money back and electric bill too?
Am i correct?
Check out this website: https://tradeblock.com/bitcoin/mining/
Most newbies in mining make a failure investing because they don't know that there is a thing called difficulty which leads to being harder and harder to make a profit. If you don't get your investment back in the first 2 to 3 months then you won't make it back. The calculator can safe you from wrongly investing.