Florida is starting a promotion where every car that arrives gets one orange per passenger. A family of 4 arrives and gets their oranges. They had planned to stop for a snack later where they would spend $15 in total, but now that they have the oranges they don't have to buy them at the stop. When they get to the stop they see that the oranges would've cost $1.5 each. What percentage of the money they planned to spend did they save instead?
The oranges would've cost $6 because 4 x 1.5 = 
<gadget id="calculator">4*1.5</gadget>
<output>6</output>
6.
The proportion of their original spending plan was .4 because 6 / 15 = 
<gadget id="calculator">6/15</gadget>
<output>2/5 = around 0.4</output>
.4.
They saved 40% of the money they planned to spend because .4 x 100 = 
<gadget id="calculator">.4*100</gadget>
<output>40</output>
40.

<result>40</result>