A company sells x Samsung batteries at $p per battery. The price and demand for the battery is linearly related by p+0.5x=400. As part of the financial department, with a current price of $185, determine the price elasticity of demand of the battery, and analyse as it relates to demand and revenue. Also, if this price is to be increased by 10%, determine the percentage change in demand and the values of p for which the demand is unitary