26x13=338 sq ft
26ft by 13ft = (26 x 13) = 338 square feet 1 square yard = 9 square feet 338 square feet = (338 / 9) = 37.555 square yards 38 square yards @ $2.99 per sq yd = (38 x 2.99) = $113.62 plus tax That's if you can cut what you buy to fit the 26x13 area without any scrap. You may need a little more, depending on how the raw product comes, and how accurately you can cut it.
To multiply two mixed numbers you first need to convert them to vulgar fraction form. This is done by multiplying the units by the denominator, and adding it to the numerator. For 5 1/5, you have to multiply 5x5 to get 25, then add this to the 1, giving us 26/5. For 3 1/4, you have to multiply 3x4 to get 12, and then add this to the one to give 13/4. Thus the question can be rewritten as 26/5 x 13/4. To multiply fractions you simply multiply the numerators and the denominators. 26x13 = 338 5x4 = 20. Thus the answer is 338/20 This can then be simplified into the mixed number 16 and 9/10