If a rectangle length and width are both doubled,by what percent is the rectangle area increase?
Choose the correct choice from the following options:
A) 100
B) 150
C) 300
D) 200
E) 250
let length and width are l and b   so area = lb   now after doubling both we will get area = 2l*2b = 4lb   so % increase 2 *2= 
<gadget id="calculator">2 *2</gadget>
<output>4</output>
4lb   so % increase= 400-100= 
<gadget id="calculator">400-100</gadget>
<output>300</output>
300   ANSWER:300
<result>C</result>
If a rectangle length and width are both doubled,by what percent is the rectangle area increase?