Final answer:
The tile store would charge $1,100 to install 200 square feet of tile.
Step-by-step explanation:
To find out the charge to install 200 square feet of tile, you can set up a proportion based on the given information.
Let x be the charge for 200 square feet of tile.
Using the proportion 70 square feet / $385 = 200 square feet / x, you can cross multiply and solve for x.
x = ($385 * 200) / 70 = $1,100
So the tile store would charge $1,100 to install 200 square feet of tile.