need help please

Stensels, a plastics processor, is considering the purchase of a highspeed extruder as one option. The now extrucier would cost $50, 000 and would have a residual value of $5,000 at the end of its 8 year life. The annual operating expenses of the new extruder would be $8,000. The other option that Stensels has is to rebuild its existing extruder. The rebuilding would require an investment of $30,000 and would extend the life of the existing extruder by 8 years. The existing extruder has arinual operating costs of $11,000 per year and does not have a residual value. Stensels' discount rate is 14%. Using net present value analysis, which option is the better option and by how much? Round to the nearest dollar. A. Better by $4,330 to rebuild existing extruder B. Better by $4,330 to purchase new extruder C. Better by $6,083 to rebuild existing extruder D. Better by $6,083 to purchase new extruder