Four Point Seven Million

You are sizing the write path for a social app. The brief gives you 4.7 million daily active users, each performing an average of 11 write actions per day, and traffic that peaks at 3.2 times the daily average rate.

What peak write QPS do you plan for?

$\text{QPS}_{\text{avg}} = \frac{\text{DAU} \times \text{actions per user per day}}{86{,}400}$