A family of 2 adults and 4 children visited Sentosa during the June holidays.An adult ticket cost $18.90 and a child ticket $12.80 during the promotional period.if the family enjoyed the promotional price,what was the total cost of the tickets for the family ?and what would be the change if a $100-note was used to purchase the tickets ?
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Answer:the ticket of 2 adults=18.20×2 = 37.80$
the ticket of 4 childs=12.80×2= 51.20$
the sum of tickets cost=89$
thay give 100$
the change =11$
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