Lawrence paid $100 for 40 candy bars. He incorrectly calculates the rate per pretzel to be $140 per pretzel. Which statement identifies the error Lawrence most likely made in determining the rate per candy bar and describes the correct method for determining the rate per pretzel?

Anew obstacle course is home to several new types of challenging obstacles. one such obstacle is traversing a 15-stair staircase. to make it more challenging, the stairs are not uniformly spaced. rather, the vertical space between consecutive stairs for the first 10 stairs is 113 feet and the vertical space for the last 5 stairs is 134 feet. what is the total vertical distance traveled ascending and descending the entire 15-stair staircase?