You are the most despised of characters - a spammer.
SPAM Levels for Profitability. See attached file for full problem description.
Please see the attached file.
A. Amount of emails making through to individual users:
1M - 345K - 175K - 215 = 265,000
Clicked emails = 0.0025*265K = 662.5 (emails)
Purchased from clicked ...
The solution provides detailed explanations and discussion for the problem.