Find a number that makes a counter example

Omar is going on a road trip! the car rental company offers him two types of cars. each car has a fixed price, but he also needs to consider the cost of fuel. the first car costs $90 to rent, and because of its fuel consumption rate, there's an additional cost of s0.50 per kilometer driven.

School has 204 sixth grade students. if the sixth grade is 30% of the total school, how many students are in the middle school?

Me d is also an option but i couldn't get it in the picture