The sale price of every item in a store is 85% of its usual price. The usual price of a backpack is $30, what is its sale price?The usual price of a sweatshirt is $18, what is its sale price?

You have 2 sides that are 2 cms and you have 6 sides that are 1/2 cm and you have 4 sides that are 1 cm. the smallest sides are 1/2 the medium sized sides are 1 and the smallest are 1/2. so to find the perimeter you have to add them all up together so your answer will be 11 cm's