First off, Erin ran the fastest marathon, so hers was faster than mikes. You have to find how much faster in time units Erin's marathon was than mikes. You convert that number into a percentage.
For this we can do 5.2 cents times 1.5 to determine how much zippy is costing the company per box extra so .052 x 1.5 is roughly 7.8 cents per box. So now 7.8 cents Times 484, .078 x 484 is roughly $37.752 cents or $37.75
