Question:
Mandana is ordering new tile for her kitchen floor. The area of the floor is 119.9 square feet, and she wants to order between 15% and 20% extra of the materials. Which of the following is a reasonable amount of tile for Mandana to order?
A. 134 square feet
B. 140 square feet
C. 137 square feet
D. 145 square feet
Answer:
B.  140 square feet  is a reasonable amount of tile for Mandana to order
Step-by-step explanation:
Total area of the floor  = 119.4 square feet
If Mandana is ordering 15% extra, the the tile will be
= Â 119.4 + Â 15% 119.4
= Â [tex]119.4 + \frac{15}{100} \times 119.4[/tex]
= [tex]119.4 + 0.15 \times 119. 4[/tex]
= 119.4 + 17.91
=137.31 Â square feet
If Mandana is ordering 20% extra, the the tile will be
= Â 119.4 + Â 20% 119.4b
= [tex]119.4 + \frac{20}{100} \times 119.4[/tex]
= [tex]119.4 + 0.2 \times 119. 4[/tex]
= 119.4 Â + 23.88
= 143.28 Â square feet
Thus from the options
134< Â 137< Â 137.31 < Â 140< 143.28< Â 145
