It costs $1000 to paint the 2 lines that divide a Particular street into 3 traffic lanes. How much would it cost to paint the lines necessary to create 6 lanes on a similar street?

Since the cost of 2 lines is $1000, the cost of painting one line is $500. Each new line creates one new lane, so 3 more lines must be painted to create 6 lanes. The total cost of the 5 lines at $500 per line is 5 x $500, or $2500.