A principal orders t-shirts and wants to check some of them to make sure they were printed properly, she randomly selects 7 of the 10 boxes and checks 20 in one box and 40 in others. What type of sampling is this?

Aclothing store has the sign shown in the shop window. pani sees the sign and wants to buy 3 shirts and 2 pairs of jeans. the cost of each shirt before the discount is $12, and the cost of each pair of jeans is $19 before the discount. write and simplify an expression to find the amount pani pays if a $3 discount is applied to her total