It costs $.10 to print one page. Jenny wants to print 7 copies of her 25-page essay. She also wants to buy 7 pens that each cost $1.50. If she pays the store with 2 twenty dollar bills, how much money should she get in change?
Jenny needs to print 7*25= 
<gadget id="calculator">7*25</gadget>
<output>175</output>
175 pages.
This will cost 175*$.10 =$
<gadget id="calculator">175*.10</gadget>
<output>17.5</output>
17.5.
The pens will cost 7*$1.50=$
<gadget id="calculator">7*1.5</gadget>
<output>10.5</output>
10.50.
In total, she will spend $17.5+$10.5=$
<gadget id="calculator">17.5+10.5</gadget>
<output>28</output>
28.
Since she pays with 2 twenty dollar bills she pays with 2*20=
<gadget id="calculator">2*20</gadget>
<output>40</output>
40 dollars.
Thus, she will get $40-$28=$
<gadget id="calculator">40-28</gadget>
<output>12</output>
12 in change.

<result>12</result>