The perimeter is 160 ft and Shauna is correct. She is correct because if she is looking for the perimeter of the actual auditorium, then she has done it correctly. Since the scale is 1 in= 20 feet, that means that 2 inches= 40 feet. It's a square so that means all the sides are equivalent. To find the perimeter we simply just need to multiply 40*4 which would give us 160. Pete got 160 ft is also correct because, he multiplied 2*4 which got him 8 and then 8*20 to get the perimeter of the auditorium. I hope this helped ^^