Answer:
Their percent increase in car sales is 200%.
Explanation:
Given:
Last month, jones car lot sold $150,000.00 worth of cars.
This month their car sales reached $450,000.00.
Now, to find the percent increase in car sales.
Last month car sold = $150,000.00.
This month sale of car = $450,000.00.
So, to get the amount of increase we subtract:

=

Now, to get the percent of increase:



Therefore, their percent increase in car sales is 200%.