The following partial data relates to a national economy (all figures in $billions): Y Total Leakages Total Injections $0 $0 $400 100 40 400 200 80 400 Refer to the above table to answer this question. What is the equation for AE? a. AE = 400 - 0.6Y b.AE = 0.6 + 400Y c. AE = 400 + 0.4Y d. AE = 400 + 0.6Y e. AE = 0.4 - 400Y