Help i don't know what to do please help

If the sales price of a dvd is $20 and the markup is 34%, what is the cost of the dvd?

Which number produces an irrational number multiplied by 1/3

Pleasse me i need an answer. give me the correct answer. answer if you know it ! the club will base its decision about whether to increase the budget for the indoor rock climbing facility on the analysis of its usage. the decision to increase the budget will depend on whether members are using the indoor facility at least two times a week. use the best measure of center for both data sets to determine whether the club should increase the budget. assume there are four weeks in a month. if you think the data is inconclusive, explain why.