QUESTION $8$

Ibis Cafe is a local coffee bar. Using Excel, the manager of Ibis Cafe estimates the weekly demand function for their grand mocha coffees to be $Q_d=650-15\mathrm{.}25P.$ The estimated regression equation suggests that if Ibis Cafe decreases its price of grana mocha coffees from $$7\mathrm{.}50$ to $$5\mathrm{.}50,$ the predicted or estimated quantity demanded of coffees would $q,$

increase by $30\mathrm{.}5$

decrease by $30\mathrm{.}5$

not change

exactly double