Answer: He must sell at least 11 drawings to reach $2000.
Explanation:
The artist sold 3 paintings in one month, the paintings is $400 each so if we were to do 400*3 it would give us 1,200.
Now if we do 11*75 (Each DRAWING costs $75) it would be $825.
$825+1,200= 2,025 will be the closest to 2,000