Rosyth Sch 2006 PSLE Math Prelim Q34

For every 10 tickets purchased, a 20% discount will be given to the 10th ticket. If each ticket cost $8.50, how much did Keith have to pay for 12 tickets?

Solution

1 ticket ----- $8.50
9 tickets ----- 9 x $8.50 = $76.50
10th ticket ----- 80% x $8.50 = $6.80

10 tickets ----- $76.50 + $6.80 = $83.30
2 tickets ----- 2 x $8.50 = $17

Total for 12 tickets ----- $83.30 + $17 = $100.30

Answer: Keith had to pay $100.30