Novel Electronics Sold 400 Technova Smartphones in the First Week

Novel Electronics sold 400 Technova smartphones in the first week of October 2013 at a price of $250 per unit. The following week, it reduced the price to $230 per unit and it saw sales increase by 20%. What is the price elasticity of demand of Technova smartphones?

A) 0.5
B) 1
C) 1.5
D) 2
E) 2.5