Sto ck F h as a bet a of 1.5 wh ile stoc k P has a be ta of 0.75, the exp ected rate of retu rn on an av erage stock is 15% an d the risk-fr ee ra te is 9%. By how m any perce nt do es the requ ired rate of re turn on the ri skier st ock exce ed the requir ed rat e of ret urn of the less risky stock?