Rafael is trying to book a graduation party. The party pavilion charges $100 for the first 10 people, $150 for more than 10 and up to 20 people, $200 for more than 20 and up to 30 people, $250 for more than 30 and up to 40 people , and $275 for more than 40 and up to 50 people. If Rafael wants to spend $250 for this party how many people can he invite? (1 point ) 30 < x < 50; 30 < x <= 40; 20 < x < 40; 20 < x <= 30