Mr. Hong brought his 7 year-old daughter, Jin and his 10 year-old son, Cai, to Redwood Amusement Park. An Admission ticket costed $8.50 for adults and $5.25 for kids (9 and under). Mr. Hong had a coupon for $2.00 off an adult admission. What was the total cost of admissions tickets Mr. Hong spent?
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