Can you determine the fee for 30 ride tickets? Explain

Answer:
30 ride ticket $18
Step-by-step explanation:
5 tickets.....no discount
10 tickets 5% discount (10-0.5)
15 tickts 10% discount 15-1.5=13.5
20 tickets 20%discount 20 -4=16
25 tickets 30%
30 tickets 40%discount 30-12=18