If an average person produces 2 million red blood cells per second, how many red blood cells will be produced in a 24 hours period

I believe the answer is 172,800,000,000 per day (24 hours)

How I Got That Answer:

I calculated 2 million times 60

=120000000 per minute

Then I calculated that times 60 again

=7200000000 per hour

Then I calculated that times 24

=172800000000 per day