Lymbo Company, must install safety devices throughout its plant or it will lose its insurance coverage. The safety device costs $91000 to install and $20000 to maintain annually. The safety device has a 7-year income tax life and a 13-year useful life. Lymbo's discount rate is 11 per cent, its marginal tax rate is 30 per cent and it uses straight-line depreciation. Compute the NPV considering the depreciation tax shield and enter the answer below