At the beginning of march a store brought a clarinet at a cost of $72 and mark it up 150%. at the end of the month the clarinet her not sold, so the store market down 40%. what was the discount price? can someone me i need los of !

In a survey of 1015 adults, a polling agency asked, "when you retire, do you think you will have enough money to live comfortably or not. of the 1015 surveyed, 534 stated that they were worried about having enough money to live comfortably in retirement. construct a 90% confidence interval for the proportion of adults who are worried about having enough money to live comfortably in retirement.