Calculating the rate of increase in an algebraic word problem.

A manufacturer reports the production of 120,000 units in the third quarter of the year.
This is an increase of 15,000 units over production in the second quarter. What was
the rate of increase for the period?
a. 11.11%
b. 12.5%
c. 14.29%
d. 15%

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...quarter, the # of units = 120,000 - 15,000