One mc question options: 100, 400, 200, 300

The following supply and demand schedules represent a market that starts in equilibrium. Then there is a shock because of which the quantity supplied at each price decreases by 200. What is the decrease in equilibrium quantity caused by the shock? Price Quantity Quantity Demanded Supplied 10 800 200 20 600 400 30 500 500 40 400 600 50 100 1000