To find quantity demanded when p = ₦18 Qd = 7p - 12 7(18) - 12 126 - 12 Qd = 114units To find quantity supplies at ₦18 Qs = 4p + 9 4(18) + 9 Qs = 72 + 9 Qs = 81 units To find the magnitude of excess demand Excess demand = 114 - 81 = 33 units