Answer:
The answer is budget surplus
Explanation:
Budget surplus arises when the government revenue through taxes is more than the its spending. Here government generates three billion, five hundred million($3,500,000,000)
And budget deficit is when the government spending is more than its spending. Here government generates three billion, five hundred million($3,100,000,000)
The surplus here is $400,000,000($3,500,000,000 -$3,100,000,000)