Splitting the cost of the model:

Cost of the model for 20 weeks:  1000 euro

Divided by 10 people:  100 euro each-----5 euro per session

Divided by 9 people:  111.12 euro each---5.56 euro per session

Divided by 8 people:  125 euro each-------6.25 euro per session

Divided by  7 people:  142.86 euro each---7.15 euro per session

Divided by 6 people:  166.67 euro each----8.34 euro per session

Divided by 5 people:  200 euro each--------10 euro per session