Calculate equilibrium income

Given,

 Consumption function =600+0.7Y

Calculate equilibrium income when investment I=20

In equilibrium,

Y=C+I

Y=600+0.7Y+20

Y=620+0.7Y

Y-0.7Y=620

0.3Y=620

Y=620/0.3

Y=2066.67

Equilibrium income Y=2066.67