Final answer:
Jon would need to mow 40 lawns to make $999 plus tax.
Step-by-step explanation:
To find out how many lawns Jon would need to mow in order to make $999 plus tax, we can set up an equation. Let's assume that he mows x number of lawns.
The amount of money Jon makes is directly proportional to the number of lawns he mows. So, we can write the equation as:
25x = 999
To solve for x, we divide both sides of the equation by 25:
x = 999 / 25
x ≈ 39.96
Since x represents the number of lawns, we round up to the nearest whole number.
Therefore, Jon would need to mow 40 lawns to make $999 plus tax.