Three people pull simultaneously on a stubborn donkey. Jack pulls directly ahead of the donkey with a force of $64\mathrm{.}3$ N$,$ Jill pulls with $66\mathrm{.}3$ N in a direction $45\backslash$deg to the left, and Jane pulls in a direction $45\backslash$deg to the right with $121$ N$.($Since the donkey is involved with such uncoordinated people, who can blame it for being stubborn?$)$ Determine the magnitude F of the net force the people exert on the donkey.

What is the direction @ of the net force? Let $0$ define straight ahead, with positive angles to the left and negative angles to the right. Express $0$ as an angle with a magnitude between O and $90\backslash$deg $.$