Mariah is setting tile on the floors of her rectangular kitchen and square breakfast area.the diagram shows the dimensions of the 2 rooms. Each tile covers 1 square foot.if each tile cost $1.29, how much will Mariah pay to buy tile for both rooms?

at first,
area of breakfast area,
[tex] = {10}^{2} [/tex]
[tex] = 100 {ft}^{2} [/tex]
area of kitchen,
[tex] = 10 \times 14[/tex]
[tex] = 140 {ft}^{2} [/tex]
now, total area,
[tex] = 100 + 140[/tex]
[tex] = 240 {ft}^{2} [/tex]
rate per square ft = $ 1.29
total cost ,
[tex] = 240 \times 1.29[/tex]
= $ 309.60
answer is B.