Safe W

pls help me for this question .. thanks

The block of weight W is hang from a pin at A . The bars AB and AC are pinned to the support at B and C. The areas are
800mm^2 for AB and 400mm^2 for AC . Neglecting the weigth of the bars determine the maximum safe value of W if the
Stress in AB is limited to 110Mpa and that in AC to 120Mpa