Help: How many cashiers McDonald has - Brain teaser

Our Goal: #Cashiers_McD

1. #Cashier = (Cashier/McD) * (McD)
   • = 3/Store (assumption) * {(McD/person) * (Pop. Size)}
   • = 3/store * 1 store/100K (assumption1) *7 Billion (global population size)
   • assumption 1: While the US has 1 McD per 10K people, places such as Middle East, East Europe, Rural Asia, Africa may not have as many. Some countries like North Korea has none, I guess! So 1 mcD per 100K on average
   • = 3 * 1/100000 *7000000000 = 210,000
2. If you want to integrate a trend:
   • say we have a positive trend as new McDs are being opened every year
   • Approximately 10% per year, so 10% of the total amount will increase
   • = 210K*10% = 21K
   • Answer of 210K + 21K = 231K
3. The answer would be: On average, McDonald has 231,000 Cashiers.