Anyone know how to solve for PART A, B AND C

Answer:
7.50+(2.75x7), she stayed there for 8 hours, h=8 total hours
Step-by-step explanation:
7,50 for the first hour and 2.75 for extra hours if we try to add hours and the prices to get to 26.75 we get 7 more hours so in total 8 hours