McGillar Golf is evaluating different golf practice equipment. The high$-$end equipment costs $$90,000.$ It costs $$12,000$ to operate each year and has three years of economic life. The firm uses straight$-$line depreciation method, and the equipment is fully depreciated to zero over $3$ years. The equipment will have a salvage value of $$20,000$ at the end of the project's life. The tax rate is $30\%.$ The relevant discount rate is $12\%.$

a$)$ Calculate the NPV of this project?

b$)$ Using the EAA method, calculate the equivalent annual cost of the project.