It takes Dawn 2 hours to paint 1 watercolor painting.  She was recently commissioned to paint a series of 12 paintings.  Dawn will earn $3,600.00 for these 12 paintings.  How much money does Dawn make per hour?
It takes her 2 hours to paint 1 picture and she needs to paint 12 pictures so it will take 2*12 = 24 hours
Dawn will make $3,6000.00 for 24 hours of work which means she makes 3600/24 = $150.00 per hour of work