Fat tire bicycle company currently sells $36,000$ bicycles per year. The current bike is a standard balloon tire bike selling for $$120,$ with a production and shipping cost of $$40.$ The company is thinking of inteoducing an off$-$road bike with a projected selling price of $$410$ and a production and shipping cost of $$275.$ The projected annual sales for the off$-$road bike are $15,000.$ The company will lose sales in fat tire bikes of $7,500$ units per year if it introduces the new bike, however. What is the erosion cost from the new bike? Should fat tire start producing the off$-$road bike?