Tricky tasks to exercise your brain

The farmer needs to saw the bar in three parts: 1/7, 2/7, and 4/7 — only two cuts are needed and this is how the farmer had to pay:

Monday: pay 1/7 of the bar.

Tuesday: pay 2/7 of the bar and take away 1/7.

Wednesday: give 1/7 to the worker again.

Thursday: give 4/7 of the bar and take 1/7 and 2/7.

Friday: give the 1/7 of the bar again.

Saturday: give the 2/7 of the bar and take the 1/7.

Sunday: give the worker the 1/7 of the bar.