At a store, toothbrushes cost x dollars and bars of soap cost y dollars. One customer bought 4 toothbrushes and 2 bars of soap for $22. Another customer bought 12 toothbrushes and 10 bars of soap for $76. Both amounts do not include tax. How much does 1 toothbrush and 1 bar of soap cost?

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.