With the concept of first in, first out method, then we can use the formula below to solve for the number of equivalent units of production for that period.
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number of equivalent units of production
= Total number of units completed during that period (A) – Number of units completed in process at the beginning of the period (B) + Number of units completed at the end of the period (C)
= A – B + C
We know that,
A = 9000 units
So we solve for B and C.
B is 60% of the 500 units, therefore:
B = 0.60 * 500 = 300
C is 30% of the 600 units, therefore:
C = 0.30 * 600 = 180
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Substituting the values into the equation:
number of equivalent units of production  = 9000 – 300 + 180
number of equivalent units of production  = 8880 units
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Answer:
A. 8880