A candy store categorizes its stock as either chocolates or fruit candies. Of customers who make a purchase, they find that 65% buy chocolate and 45% buy fruit candies. They further observe that 80% of their customers that buy both chocolate and fruit candies are children, 70% who buy just fruit candies are children, and 50% who buy just chocolate are children. What percent of the stores total customers are children? Round to 3 significant figures