Aa book cost $9.60 plus sales tax after sales tax the book is $10.20 what is the sales tax . ( show how to do it)

If you draw a card with a value of three or less from a standard deck of cards, i will pay you $43. if not, you pay me $11. (aces are considered the highest card in the deck.) step 1 of 2 : find the expected value of the proposition. round your answer to two decimal places. losses must be expressed as negative values.