Harper drinks a 1/2 bottle of mineral water per day.  She buys the mineral water by the case at a big box store.  They come 24 bottles to a case and are currently on sale for $12.00.  If she wants to buy enough cases to last her 240 days, how much will she spend?
She drinks 1/2 bottle a day and there are 24 bottles in a case so a case will last 24/.5 = 
<gadget id="calculator">24/.5</gadget>
<output>48</output>
48 days.
She needs enough to last her 240 days and 1 case will last her 48 days so she needs 240/48 = 
<gadget id="calculator">240/48</gadget>
<output>5</output>
5 cases.
Each case is on sale for $12.00 and she needs 5 cases so that's 12*5 = $
<gadget id="calculator">12*5</gadget>
<output>60</output>
60.00.

<result>60</result>