A college with 6966 students had a teacher for every 129 students last year. This year, 1143 students joined the college and 221 students left. Similarly, 6 teachers left the college, and 10 teachers joined. What is the new ratio of the teacher to students (number of students per teacher)?
One ticket to a show costs ₩20. Haeun buys a total of 6 tickets for the show using a coupon that gives her a 20% discount. Seoyoon buys 8 tickets, using a coupon that gives a 25% discount. How much more did Seoyoon pay than Haeun?