20% tip on a bill of $111.82

What is the measure of angle tvu shown in the diagram below

Suppose that prices of a gallon of milk at various stores in one town have a mean of $3.71 with a standard deviation of $0.10. using chebyshev's theorem, what is the minimum percentage of stores that sell a gallon of milk for between $3.41 and $4.01? round your answer to one decimal place.

Ineed some on this. not sure how to solve.