How to find yield precentage help?

a student places an iron nail with a m of 2.32g in a flask of CuSO4.The nail reacts completly leaving a quantity of copper metal in the bottom of the flask.The student finds the m of the recovered copper to be 2.51g.the equation for this reation is Fe+CuSO4->FeSO4+Cu .what is the expected yield of copper