Question: The learning curve for a certain task is given by the equation p=0.5+0.5(n-1)/1+0.9(n-1) n>0 where P is the fraction of correct responses after n trials.

The learning curve for a certain task is given by the equation p=0.5+0.5(n-1)/1+0.9(n-1)

n>0

where P is the fraction of correct responses after n trials. Find the value after 90 trials.

A: 0.57

B: 0.56

C: 0.55

D: 0.52

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