please show work chegg solution isnt correct

u and d not given

11.1 Consider a one-period binomial model with h-1, where S-3100, r-0,0-30%, and 6 0.08. Compute American call option prices for K $70, S80, S90, and $100. a. At which strike(s) does early exercse occur? b. Use put-call parity to explain why early exercise does not occur at the higher strikes c. Use put-call parity to explain why early exercise is sure to occur for all lower strikes than that in your answer to (a). 11.1 Consider a one-period binomial model with h-1, where S-3100, r-0,0-30%, and 6 0.08. Compute American call option prices for K $70, S80, S90, and $100. a. At which strike(s) does early exercse occur? b. Use put-call parity to explain why early exercise does not occur at the higher strikes c. Use put-call parity to explain why early exercise is sure to occur for all lower strikes than that in your answer to (a)