Heather bought 9 video on sale for $126. at the regular price, she would have spent $171. How much did heather save per video at the sale

Sherrie is baking a pie for her family. she leaves the room and comes back to 35% of the pie having been eaten before she can put the topping on. how much 1 square inch strips of dough will she need for the top, now that a portion is missing? round your answer to the nearest while nimber.