A reservoir cover is 12,000 acres and is 20 feet thick. The formation has initial porosity of 0.25. The pore volume compressibility of the reservoir rock is 3.0 x 10^(-6) psi^(-1) . Calculate the change in reservoir pore volume (in barrels) if the reservoir pressure decreases by 2,000 psi. (1 acre.ft = 7758 barrels)