For bringing each copper coin from the bottom of a river, a coin-diver gets 20 cents, and for each brass coin she gets 25 cents. If after one dive, she got $3.40. What is the minimum number of copper coins that she brought? Choose the correct choice from the following.
A) 4	B) 3	C) 2	D) 1	E) 0
Let's subtract $0.20 until we find a multiple of $0.25.   $3.40 - $0.20*2 = $3.00, which is a multiple of $0.25.   The answer is 2. 3.40 -  0.20*2= 
<gadget id="calculator"> 3.40 -  0.20*2</gadget>
<output>3</output>
$3.00, which is a multiple of $0.25.   The answer is 2.
<result>C</result>
For bringing each copper coin from the bottom of a river, a coin-diver gets 20 cents, and for each brass coin she gets 25 cents. If after one dive, she got $3.40. What is the minimum number of copper coins that she brought?