问问这个微观经济的问题The quantity of pencils sold is 1000 at the unitp

问问这个微观经济的问题
The quantity of pencils sold is 1000 at the unit
price $0.5.Suppose the price elasticity of demand for pencils by the initial
value method is 2,and you would like to increase the quantity sold to 1200.
Then the new price for pencils must be:
A) $0.05.
B) $0.25.
C) $0.30.
D) $0.45.