The extremities of an 8m long straight bamboo pole rest on two smooth pegs P and Q in the same horizontal line. A heavy load hangs from a point R of the pole. If PR = 3RQ and the pressure at Q be 325 gm-wt more than that of P, the weight of the load is -

A 500 gm-wt

B 600 gm-wt

C 650 gm-wt