(30 points) A firm decides to purchase a plastic injection molding machine for $500.000. It s estimated that the machine can produce a total of 20 million parts in its life span of 15 years when it?s salvage value is estimated to be zero. The following table shows the usage of the machine in the first. 6 years of its operationIf the firm decides to sell the machine and purchase a new one, what is the value of the machine at the end of year 6 using units of production method