Answer:
200%
Step-by-step explanation:
[tex]\boxed{\begin{minipage}{8 cm}\underline{Percent change formula}\\\\$\rm Percent\:change=\dfrac{final\:value-initial\:value}{initial\:value} \times 100$\\ \end{minipage}}[/tex]
Given values:
Substitute the values into the percent change formula to find the percent increase in car sales:
[tex]\begin{aligned} \implies \textsf{percent change}&=\dfrac{450000-150000}{150000}\times 100\\\\&=\dfrac{300000}{150000}\times 100\\\\ &=2\times 100\\\\&=200\%\end{aligned}[/tex]
Therefore, the percent increase in car sales was 200%.