In a school, there are 60 teachers and 1200 students.
30% of the students are bilingual.
15% of the teachers are bilingual.
How many of bilingual students and teachers are there altogether?

I'm at a bookstore with $\$35$ in my pocket and a $20\%$-off coupon. what is the cost of the most expensive book i can buy with my money and the coupon? (assume that there are books of every possible price in the bookstore. it's a large bookstore! )