The economy is in equilibrium when $\mathit{A}\mathit{D}=\mathit{A}\mathit{S}\left(\mathit{Y}\right)$
Autonomous consumption and Investment expenditure $=\mathrm{₹}700$ crores
Marginal propensity to consume (MPC) $=0.8$
National Income $\left(\mathit{Y}\right)=\mathrm{₹}4,000$ crores
$=\left(\overline{\mathrm{C}}\right)+\mathrm{MPC}\left(\mathrm{b}\right)\times \mathrm{Y}$
$=700+0.8\times 4,000$
$=700+3,200=3,900$

( $\mathrm{₹}3,900$ crores is not equal to $\mathrm{₹}4,000$ crores)
The economy is not in equilibrium.