The cost of a Washing machine was $400 in 1985. In 2014, the cost had increased to $800. What was the percent increase in the cost of Washing machine? Choose one
A) 10
B) 40
C) 60
D) 200
E) 100
Increase = 800 - 400= 
<gadget id="calculator">800 - 400</gadget>
<output>400</output>
400   % increase= 400*100/400= 
<gadget id="calculator">400*100/400</gadget>
<output>100</output>
100%   Answer: option 100
<result>E</result>
The cost of a Washing machine was $400 in 1985. In 2014, the cost had increased to $800. What was the percent increase in the cost of Washing machine?