Breakdown of the earnings

For the simplicity are using an 1 ETH investment amount.

Initial investment 1 ETH Minus 4%(0.04) = 0.96 ETH

Day	Accumulated reward	Value of Investment
1	0.0768 ETH	1.0368 ETH (0.96 + 0.0768)
2	0.082944 ETH	1.1197 ETH (1.0368+0.082944)
3	0.08957952 ETH	1.2093 ETH
4	0.0967458816 ETH	1.3060 ETH
5	0.104485552128 ETH	1.4105 ETH
6	0.11284439629824 ETH	1.523 ETH
7 (Harvesting)	​	​

Day 7 is the day you take of your ETH rewards

Accumulated Reward 8% = 0.1218719480020992 ETH

Harvest Carreths (ETH)= 0.1218719480020992Eth (12.18% of your Initial Investment)

After harvesting your miners will keep working for you so the accumulated reward will be higher day by day