The demand curve for a product sold by Big G is given by Q$\_$x$^$d$=1200-3$P$\_$x$-0\mathrm{.}1$P$\_$z where Pz $=$ $$300.$

What is the own price elasticity of demand when Px $=$ $$140?$ Is demand elastic or inelastic at this price? What would happen to the firm$$s revenue if it decided to charge a price below $$140.$

For the first time I two years, Big G raise the price of X by $4\%.$ If$,$ as a result of this price increase, the volume of all X sold by Big G dropped by $5\%,$ what can you infer about the own price elasticity of demand for product X by Big G$?$ Can you predict whether the revenues on sales of its brand increased or decreased?