$118000
Explanation:
Calculation for conversion cost incurred
First step is to calculate the Prime Cost
Opening stock Of Raw Material $18000
Add: Material purchased $42000
Less: Closing stock of raw material ($15000)
Add: Direct Labour $30000
Prime Cost $75000
Now let calculate the conversion cost incurred
Prime cost $75000
Add: overhead expenses $40000
[($30000/ $7.50)**10]
( 4000 * $10=$40000)
Total $115000
($75000+$40000)
Add: opening work in progress $9000
Total $124000
($115000+$9000)
Less: Closing stock of work in progress ($6000)
Factory cost or conversion cost $118000
($124000-$6000)
Therefore For March, conversion cost incurred was $118,000