I cannot calculate delta. Do we equate delta to phi d1. plugginging in the data in the equation for d1 for call options (Garman-Kohlagen formula) gives me d1 = 0.488095
Hi Yes, for a call option we have: \(\Delta_{call}=\Phi(d_1)\). Using the data from the question, \(d_1\) should come out to about 0.845. Maybe it was a calculator mishap?