Mathematical expression for calculated measures like quantity/quality

Hello All,

Need help for defining best mathematical exp for quantity and quality metrics of the campaigns in the email marketing domain based on following metrics:
a. total emails fired
b. inquiry emails against the campaign offer emails
c. bounces count
d. marked as spams count
e. total responses = inquiry emails + bounces + marked as spams count

ignore the metrics like views and clicks for now....


Thanks,
Sujen

I have no idea what you're asking.