Let S = $75, K = $65, r = 3% (continuously compounded), T = 0.75, and d = 0. Let u = 1.25, d = 0.65, and n = 1. Calculate the value of a European call if D = 0.638889 and B = –30.4529.
(D is the delta sign)

Ditto - see the guidelines:
https://www.askmehelpdesk.com/finance-accounting/announcement-font-color-ff0000-u-b-read-first-expectations-homework-help-board-b-u-font.html