PLEASE HELP THIS IS DUE IN 10 MINUTES!

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

£100.80 divided by 14 equals 7.2 how would we put this as money

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.