Answer:
This is an arithmetic sequence with a common difference <em>d</em> of -5
Step-by-step explanation:
When you find out <em>d</em>, you realize the difference between the numbers to be -5. Since it is <em>d</em> and not common ratio <em>r</em>, it is an arithmetic sequence.
The fraction you are looking for is expenses/earnings
So (2500+650+434)/3600
=224/225
If you want to turn this into a percentage just multiply by 100, to give you 99.56%.