Every business plan for a children's education center has the same lines: rent, salaries, equipment, marketing. Then the center opens and money leaves through doors nobody drew.
Below are eight of those doors, taken from three consecutive months of one operating center's ledger in Latin America, with the amount each one actually cost. Figures in USD. The center collected 8,830 USD over the period, so you can read every amount as a share of real revenue rather than a share of a forecast.