A business spent $$285,000$ on a machine ten years ago. After ten years, the business projected a salvage value of $$50,000.$ Companies' average yearly revenue at this period was $$52,000.($a$)$ Did the business get a $12\%$ return on his investment? $($b$)$ Was the AW positive or negative at $12\%$ each year if the yearly M&O expense was $$10,000$ the first year and increased by a constant $$1000$ per year? Suppose the salvaged $$50,000$ was earned.