plz explain the answer as well

AD clo westil RGDP ye = equilibrium's output Gap ys = potential output 1-Labeled the diagram (1.5) 2- If Potential RGDP = 2400 (millions dollar) and Actual RGDP = 2000 (millions dollar), distinguish type of the Gap and calculate it's amount.(1.25) 3-What type of the Fiscal policy do you suggest to eliminate the Gap?.. And show new equilibrium on the graph (1.25) 4-If MPC =.75 then how much should the Government change its spending (Government spending G) to Eliminate the Gap? (1)