At the beginning of 2018, Vibgyor Company installed a just-in-time (JIT) purchasing and manufacturing system. The following information has been gathered about one of the company's products:

Theoretical annual capacity	4,200 units
Actual production	1,600 units
Production hours available	600 hours
Actual conversion cost per hour	$15

The theoretical velocity per hour is:

a.2 units.

b.7 units.

c.9 units.

d.3 units.