The spot price of the market index is $900. After 3 months the market index is priced at $920. The annual rate of interest on treasuries is 4.8% (0.4% per month). The premium on the long put, with an exercise price of $930, is $8.00. At what index price does a long put investor have the same payoff as a short index investor? Assume the short position has a breakeven price of $930.

(a) $921.90 (b) $930.00 (c) $938.10 (d) $940.00

Answer is C, can you please show work.