The dog toys Samantha buys for her dog are "buy one get one half off" and all cost $12.00 each. She buys 4 toys.  How much does she spend on dog toys?
If she buys 1 toy at $12.00 she gets the 2nd toy 1/2 off, the 2nd toy is 12*.5 = $
<gadget id="calculator">12*.5</gadget>
<output>6</output>
6.00
1 full-priced toy is $12.00 and 1/2 priced toy is $6.00 so these 2 toys come to 12+6 = $
<gadget id="calculator">12+6</gadget>
<output>18</output>
18.00.
She buys 2 more toys that are "buy one get one 1/2 off" so all total she spends 2*18 = $
<gadget id="calculator">2*18</gadget>
<output>36</output>
36.00.

<result>36</result>