Edmund is buying a new computer and needs to save up $75 before he has enough. He convinces his parents to pay him for extra chores. He normally has to do 12 chores a week. His parents agree to pay him $2 for every extra chore he does during the week. If he does 4 chores a day for two weeks, how much does he earn?
In two weeks, he has to do 24 chores because 2 x 12 = 
<gadget id="calculator">2*12</gadget>
<output>24</output>
24.
He now does 28 chores a week because 7 x 4 = 
<gadget id="calculator">7*4</gadget>
<output>28</output>
28.
He does 56 chores in two weeks because 2 x 28 = 
<gadget id="calculator">2*28</gadget>
<output>56</output>
56.
He has done 32 extra chores because 56 - 24 = 
<gadget id="calculator">56-24</gadget>
<output>32</output>
32.
He earns $64 because 2 x 32 = 
<gadget id="calculator">2*32</gadget>
<output>64</output>
64.

<result>64</result>