HELP ME PLS LOV U HUYS ,333<33445

Can you guys plz answer this question in order and quickly plz i will give 30 points

Cassie is traveling 675 miles today to visit her brother and his family. so far, she has stopped for gas three times. at the first stop, she put in 7.1 gallons of gas and paid $23.79. at her second stop, she put in 5.8 gallons of gas and paid $19.08. and, at the third stop, 6.6 gallons and paid $20.39. at which stop did casey pay the most for gas?

The measure of one angle of an octagon is two times smaller that of the other seven angles. what is the measure of each angle?