Dear Student
Cost of one ticket = Rs. 450
Discount on each ticket = 15%
Discount on one ticket = 15% of 450
= 15 × 450 = Rs. 67.5
100
Cost of one ticket after discount = 450 - 67.5 = Rs. 382.5
Total number of pupil = 30
Total amount of tickets = 30 × 382.5 = Rs. 11475
Regards