Scenario 4.3: The Demand for Erasers (Q) Is Given as Follows

Scenario 4.3:
The demand for erasers (Q) is given as follows:
Q = 240 - 4Pe + 2I + Pb + A
where Pe is the price of erasers
I is the level of income
Pb is the price of another good
A is the level of advertising
Suppose that Q = 240, Pe = 10, Pb = 10, and A = 2.
-The point price elasticity of demand is -1/2. The price of the product increases from $1.00 to $1.10. Given the information in Scenario 4.3, the quantity demanded will decrease by approximately:

A) 5 units.
B) 5 percent.
C) 10 units.
D) 10 percent.
E) none of the above