Determine the epоxy mоdificаtiоn fаctor, ψe, for а rectangular beam with b = 18 in. and d = 20 in., four epoxy-coated No. 8 Grade 60 tension-reinforcement bars placed in the top of the beam, and No. 3 Grade 40 stirrups located every 10 in. along the span. Assume 4,000-psi lightweight concrete and a clear cover of 1.5 in.