Details and assumptions
Please write your answer in decimal form, rounded (if necessary) to the nearest hundredth.
A note on the source
This problem was taken from the Ole Miss Math Contest, which was hosted by Dr. David Rock of The University of Mississippi; the contest has not been so active recently and will probably be on hiatus for the foreseeable future. This problem was taken from the 'Algebra in Action' Challenge Mode section.
Image source: Wojtek Witkowski, via Unsplash archive