Sally Statistics is implementing a system of statistical process control (SPC) charts in her factory in an effort to reduce the overall cost of scrapped product. The current cost of scrap is $X per month. If an 80% learning curve is expected in the use of the SPC charts to reduce the cost of scrap, what would the percent- age reduction in monthly scrap cost be after the charts have been used for 12 months? (Hint: Model each month as a unit of production.)