Assume that an apartment rents for P650 per month and that price 10,000 units are rented. When the price increases to 700 per month, 13,000 units are demanded into the market. By what does apartment demanded increase? what is the price sensitivity and the coefficient? Show your solution

If the Price of oil increases by 10% and the quantity demanded falls by 5% then the price elasticity of demand for oil is?