A driver just filled the car's gas tank with 36 liters of gasohol, a mixture consisting of 5% ethanol and 95% gasoline. If the car runs best on a mixture consisting of 10% ethanol and 90% gasoline, how many liters of ethanol must be added into the gas tank for the car to achieve optimum performance?	Choose the correct option:
A) 1 B) 1.5 C) 2 D) 2.5 E) 3
Let x be the number of liters of ethanol added to the gas tank.   0.05(36) + x = 0.1(36+x)   0.9x = 3.6 - 1.8= 
<gadget id="calculator">3.6 - 1.8</gadget>
<output>1.8</output>
1.8   x= 2 liters   The answer is 2.
<result>C</result>
A driver just filled the car's gas tank with 36 liters of gasohol, a mixture consisting of 5% ethanol and 95% gasoline. If the car runs best on a mixture consisting of 10% ethanol and 90% gasoline, how many liters of ethanol must be added into the gas tank for the car to achieve optimum performance?