Okay, here we have this:
Considering the provided rectangle, we are going to calculate how many unit squares does he need, so we obtain the following:
First we will calculate the area of the given rectangle and then we will divide the area by the area of each tile that will be used, so we have:
Area of the rectangle=(3/10)*(4/5)=12/50=6/25ft^2
Tile area=(1/10)*(1/10)=1/100ft^2
Finally we will calculate the number of tiles by dividing the total area by the area of the tiles:
Number of tiles=(6/25ft^2)/(1/100ft^2)
Number of tiles=600/25
Number of tiles=24
Finally we obtain that the correct answer is the option A.
