Suppose that the market can be described by the following three sources of systematic risk with associated risk premiums. Factor Risk Premium Industrial production (I) 6 % Interest rates (R) 2 Consumer confidence (C) 4 The return on a particular stock is generated according to the following equation: r = 15% + 1.0I + 0.5R + 0.75C + e a-1. Find the equilibrium rate of return on this stock using the APT. The T-bill rate is 6%. (Do not round intermediate calculations.)