Andy is checking to see if all the cars in the parking lot paid for their parking. 75% of the cars have valid tickets, and 1/5th that number have permanent parking passes. If there are 300 cars in the parking lot, how many people tried to park in the lot without paying? Let's be accurate as possible.
First find how many cars have valid tickets: 75% * 300 cars = 225 cars. Then find the percentage of cars with parking passes: 75% / 5 = 15%. Then multiply that number by the total number of cars to find the number with parking passes: 15% * 300 cars = 45 cars. Then subtract all the cars with valid forms of parking to find the number parked illegally: 300 cars - 225 cars - 45 cars = 30 cars.
The answer: 30.