Mac loves the shape of quarters and is willing to trade money for them, even if he loses value. He tells his brother that he will trade him 3 dimes for a quarter or 7 nickels. He trades for 20 quarters with dimes and 20 quarters with nickels. How many dollars did Mac lose?
Three dimes is equal to $.3 because 3 x .1 = 
<gadget id="calculator">3*.1</gadget>
<output>0.3</output>
.3.
Seven nickels is equal to $.35 because 7 x .05 = 
<gadget id="calculator">7*.05</gadget>
<output>0.35</output>
.35.
Each time he trades with dimes he lose $.05 because .3 - .25 = 
<gadget id="calculator">.3-.25</gadget>
<output>0.05</output>
.05.
Each time he traded with nickels he lost $.1 because .35 - .25 = 
<gadget id="calculator">.35-.25</gadget>
<output>0.1</output>
.1.
He lost $1 from trading with dimes because 20 x .05 =
<gadget id="calculator">20*.05</gadget>
<output>1</output>
1.
He lost $2 from trading with nickels because 20 x .1 = 
<gadget id="calculator">20*.1</gadget>
<output>2</output>
2.
He lost $3 total because 1 + 2 = 
<gadget id="calculator">1+2</gadget>
<output>3</output>
3.

<result>3</result>