A school held a fundraiser where students sold tickets for a raffle. The bar graph shows the number of tickets sold by students in four grades: 9th, 10th, 11th, and 12th. The 9th grade sold 75 tickets. The 10th grade sold 15 fewer tickets than the 9th grade. The 11th grade sold twice as many tickets as the 10th grade. The total number of tickets sold by all four grades was 300. How many tickets did the 12th grade sell?