Sarah mixed craisins and chocolate chips together for a snack. Sarah bought 8 lbs. of craisins for a total of $6.80. The cost per pound of chocolate chips is 30% more than the cost per pound for craisins. Sarah bought enough chocolate chips that, when she mixed them with craisins, the mixture had a value of $0.99 per pound. Approximately what percent of the mixture, by weight, was chocolate chips?

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