A store purchased 250 pastries for $100. They resold all 250 pastries for $150. What is the store’s profit per pastry?

What is the smallest integer n such that n\sqrt{2} is greater than 20

The hawaiian alphabet has 12 letters. how many permutations are posible for each number of letters?

Tommy buys a sweater that is on sale for 40% off the original price. the expression p -0.4p can be used to find the sale price of the sweater, where p is the original price of the sweater. if the original price of the sweater is 50, what is the sale price?