John decides to take up illustration.  He draws and colors 10 pictures.  It takes him 2 hours to draw each picture and 30% less time to color each picture.  How long does he spend on all the pictures?
The coloring takes 2*.3=<T>multiply(2, 0.3)=0.6 hours less than the drawing
So it takes 2-.6=<T>subtract(2, 0.6)=1.4 hours per picture
So it takes him 2+1.4=<T>add(2, 1.4)=3.4 hours per picture
That means it takes 3.4*10=<T>multiply(3.4, 10)=34.0 hours
