Janet is considering two options to retile her bathroom. The turquoise tiles cost $13/tile and the purple tiles cost $11/tile. If Janet needs to tile two walls that measure 5 feet by 8 feet and 7 feet by 8 feet, and each square foot of wall takes 4 tiles, how much will Janet save by buying the purple tiles instead of the turquoise ones?
First find the area of the first wall: 5 feet * 8 feet = 
<gadget id="calculator">5*8</gadget>
<output>40</output>
40 square feet.
Then find the area of the second wall: 7 feet * 8 feet = 
<gadget id="calculator">7*8</gadget>
<output>56</output>
56 square feet.
Then add the areas of the two walls to find the total area: 40 square feet + 56 square feet = 
<gadget id="calculator">40+56</gadget>
<output>96</output>
96 square feet.
Then divide the number of square feet by the number of tiles per square foot to find the total number of tiles needed: 96 square feet * 4 tiles/square foot = 
<gadget id="calculator">96*4</gadget>
<output>384</output>
384 tiles.
Then find the difference in cost per tile: $13/tile - $11/tile = $
<gadget id="calculator">13-11</gadget>
<output>2</output>
2/tile.
Then multiply the number of tiles by the cost difference per tile to find the total cost difference: $2/tile * 384 tiles = $
<gadget id="calculator">2*384</gadget>
<output>768</output>
768.

<result>768</result>