Final answer:
The independent variable is the number of souvenirs sold and the dependent variable is the profit of the souvenir shop.
Step-by-step explanation:
The independent variable in this profit equation is the number of souvenirs sold (x), and the dependent variable is the profit of the souvenir shop (P).
To calculate the profit for a given number of souvenirs sold, you would plug in the value of x into the equation P(x)=23x-50. For example, if 100 souvenirs are sold, the profit would be P(100) = 23(100) - 50 = 2,250 - 50 = $2,200.