Worked examples / Customers: sign-up, checkout and fees
A $5 a month membership before anyone can buy. 4,000 shoppers a month would otherwise buy, each worth about $25. Four in ten decline to join.

It costs $40,000 a month and gets back $12,000: $28,000 a month worse off.
This is a worked example with illustrative figures, not data about any real person or company. Change any of them in the calculator and the answer changes with them.
How this answer was worked out| Step 1 | costs $40,000, gets back $12,000: -$28,000 |
Every formula is written out on the formulas page.
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