35a: Pause after each source row
Spring search: EUR 300.00, 12 enquiries, 3 customers
Office newsletter: EUR 420.00, 20 enquiries, 5 customers
Workplace guide: EUR 620.00, 30 enquiries, 6 customers
Conversion: 20.0%
EUR per enquiry: 20.67
Change newsletter enquiries from 8 to 10:
Conversion: 18.75%
EUR per enquiry: 19.38
35b: Same rule, different denominators
100 / 4 -> 25.0
100 / 0 -> None
0 / 4 -> 0.0
Combined EUR 160 / 3 enquiries: EUR 53.33
