13 Given that G201 35 C 08 of national income correct to
     13. Given that G-20.1 = 35 . C = 0.8 of national income correct to 2 decimals + 25, T = 0.2). + 10, calculate the equilibrium level  
  
  Solution
Y = C+I+G
 Y = C+35+20 = C+55
 C = 0.8Yd+25
 T = 0.2Y+10
 Yd = Y-T
 Yd = Y-0.2Y+10
 Yd = 0.8Y+10
 C = 0.8*(0.8Y+10)+25
 C = 0.64Y+8+25 = 0.64Y+33
 C = 0.64Y+33
 Y = 0.64Y+33+55
 Y = 0.64Y+88
 0.36Y = 88
 Y = 88/0.36 = $244.44
So, equilibrium level of national income is $244.44

