The Snappy Service gas station manager is thinking about a promotion that she hopes will bring in more business to the full-service island. She is considering the option that when a customer requests a fill-up, if the pump stops with the dollar amount at $19.99, the customer will get the gasoline free. Previous studies show that 70% of the customers require more than $20.00 when they fill up, so would not be eligible for the free gas. What is the probability that a customer will get free gas at this station if the promotion is implemented?