Under long run-equilibrium
For profit maximization condition. The LAC=LMC (Long run Average cost=Marginal cost)
1/2Q-25/4+w/Q=Q-25/4,we get w/Q=Q/2
Q2=2w
Also for perfectly competitive conditions,LMC=P(that is Marginal cost=Marginal revenue by producing one more output)
Q-25/4=P
Q=1500-80(Q-25/4)
79Q=1500+500
Q=25.316 rounding it to 25
and w=312.5
inserting this W into L=(2w)1/2 we get L=25
and so long run equilibrium output Q= 25,price=Q-25/4=18.75
each firm's output=25/L (since each firm only hires one media artist)=1
Long run equilibrium wage=312.5 and number of media artists L= 25
Hope it helps
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