Given:
Length = 5 ft
Width = 2 ft
Height = 5 ft
To find:
The cost of total wallpaper.
Solution:
Total surface area = 2(lw + wh + lh)
= 2(5 × 2 + 2 × 5 + 5 × 5)
= 2(10 + 10 + 25)
= 2(45)
Total surface area = 90 ft²
Cost of wallpaper per square foot = $3
Cost of wallpaper for 90 square feet = 3 × 90
= $270
Therefore total cost of wallpaper is $270.
