Annie goes to school. Today is her birthday, so Annie decided to buy some sweets for her colleagues. Every classmate got 2 candies. In the end, Annie got left with 12 candies. If there are 35 people in Annie's class in total, how much did Annie spend on candies, if one candy costs $0.1?
There are 35 people in Annie's class, which means, she has 35 - 1 = 
<gadget id="calculator">35-1</gadget>
<output>34</output>
34 classmates.
Every classmate got 2 candies, so in total Annie gave out 34 * 2 = 
<gadget id="calculator">34*2</gadget>
<output>68</output>
68 candies.
In the beginning she had 68 + 12 = 
<gadget id="calculator">68+12</gadget>
<output>80</output>
80 candies.
One candy costs $0.1, so Annie spend 80 * 0.1 = $
<gadget id="calculator">80*0.1</gadget>
<output>8</output>
8 on candies.

<result>8</result>