#### Answer

8

#### Work Step by Step

The number of ways in which a series of successive things can occur is found by multiplying the number of ways in which each thing can occur.
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1. The gender of the customer can be chosen in 2 ways.
2. The age group of the customer can be chosen in 2 ways.
3. The type of payment can be chosen in 2 ways.
Applying the Principle,
the total number of shopper categories is 2$\times$2$\times$2$=8$