Sarah has a snow removal business, and her snowplough that she purchased last year for $$3,000$ has broken down. Sarah can either repair the snowplough for $$3,500$ or purchase a new snowplough for $$6,000.$ The new snowplough will decrease the annual operating costs by $$200$ per year, has a useful life of $5$ years and a salvage value of $0.$ Once repaired the old snowplough will last for another $5$ years. If the old snowplough is not repaired, it can be sold for $$1,000.$ The new snowplough is manufactured by a Company that recently announced it has reduced its climate footprint by $10\%$ over the last $2$ years. Should Sarah repair the snowplough or purchase the new snowplough? Why?