If a house with a gable roof has a total ground area of 1880 square feet, including overhangs, how many squares of asphalt shingles are required after including 10% waste?

To determine how many squares of asphalt shingles are needed for a house with a gable roof and a total ground area of 1880 square feet, including the overhangs, you first need to understand the concept of a "square" in roofing. One square of roofing material covers 100 square feet.

Begin by calculating the total area that will need shingles, which is the ground area of 1880 square feet. The calculation for the number of squares of shingles without considering waste is:

1880 square feet / 100 square feet per square = 18.8 squares.

Next, since it is standard practice to include waste in roofing projects to account for cuts, errors, and any other potential loss of material, you add 10% to the total.

To calculate the waste amount:

10% of 18.8 squares = 1.88 squares.

Now, add this waste to the original number of squares needed:

18.8 squares + 1.88 squares = 20.68 squares.

Since shingles are typically sold by the square, you would round up to the next whole number. Therefore, it becomes necessary to order 21 squares in total. However, the option representing 21 squares is not listed directly