SAT Question ed6b7e5f: Probability And Conditional Probability answer and explanation with Desmos solution

Since the order will be selected at random, the probability of selecting an order with thin crust, given the topping is pepperoni, is equal to the number of orders with thin crust where the topping is pepperoni divided by the total number of orders where the topping is pepperoni. According to the table, there are $20$ orders with thin crust where the topping is pepperoni. According to the table, there are $30$ orders with thick crust where the topping is pepperoni. Therefore, there are a total of $20+30$, or $50$, orders where the topping is pepperoni. Thus, the probability of selecting an order with thin crust, given the topping is pepperoni, is $\frac{20}{50}$, or $\frac{2}{5}$. Note that 0.4 and 2/5 are examples of ways to enter a correct answer.