Notebooks cost $1.20 each. this weekend they will be at a sale on for $.80, what percentage is the sale? ?

Florence price's brownies and more sells all types of cookies and pastries. on tuesdays, they markdown all brownies 75% to a sale of $1.50 a dozen. find the selling price and the markdown of a dozen brownies.

The data set represents the ages of players in a chess club. 27, 34, 38, 16, 22, 45, 54, 60. what is the mean absolute deviation of the data set?

Calculate the annual effective interest rate of a 12 % nominal annual interest rate compound monthly