Starling Co. is considering disposing of a machine with a book value of $22,300 and estimated remaining life of five years. The old machine can be sold for $5,400. A new high-speed machine can be purchased at a cost of $67,100. It will have a useful life of five years and no residual value. It is estimated that the annual variable manufacturing costs will be reduced from $23.100 to $19,400 if the new machine is purchased. The differential effect on income for the new machine for the entire five years is an Oa. Increase of $43,200 b. decrease of $56, 160 Oc decrease of 43.200 Od. Increase of 556.160