Eli will photograph a wedding for a flat fee of 900 or for a

Eli will photograph a wedding for a flat fee of $900 or for an hourly rate of $120. For what length of time would the hourly rate be less expensive?

Solution

first hour = $120
second hr = 120 + 120 = 240
third hr = 120 + 120 + 120 = 360
next 1/3 hr x 120/ hr = 40; 40 + 360 = 400$

so find Hour where H*120 > $900.... H = > 900/120 = 7.5