Question 147997
First do 19-12 to find the increase.  The increase in cars is 7.  Put that over the original amount of cars, 12.  Then to find the percent, set your equation up like this: {{{7/12=x/100}}}.  This cross multiply and get {{{7(100)=12(x)}}}.  Or {{{700=12x}}}.  Divide each side by 12 and get {{{700/12=x}}}. That reduces to {{{58.33=x}}}. That is the percent increase.