Try proportions. It can help since it's asking for the "cost". Hope this helps! :)
Just find the average and whatever is more than like say 5 away is an out lier
draw an imaginary line down from the 1 dimension so you have a rectangle that is 1 by 24
area = L x w = 24 * 1 = 24 square units
now you have a triangle that is 7 at the bottom and 24 tall
area of triangle = 1/2 x base x height
so you have 1/2 * 7 * 24 which =84 square units
total area = 84 + 24 = 108 units^2
please mark brainliest