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Question:

Tickets for an amusement park cost $35. When bought over the phone, there is a 5% service charge. What is the total price for four tickets bought over the phone?

A $147
Explaination

The four tickets, without the service charge, cost $140. Multiply this amount by 5% (.05) to get the service charge: $7. Add $140 + $7 to get $147.