step 1
equate the revenue and the cost
so'
2.2x=0.6x+2000
solve for x
2.2x-0.6x=2000
1.6x=2000
x=1,250
step 2
the company will make a profit when the revenue is greater than the cost
therefore
the value of x must be greater than 1,250
x> 1,250 tubes of toothpaste
Note: For x=1,250 ----> the revenue is equal to the cost (Profit 0)