Final answer:
The reduction in work-in-process value after the firm's process redesign is $6,000 per unit, as it now takes 4 hours less (13 hours - 9 hours) at a unit rate of $1,500 to make one unit.
Step-by-step explanation:
The reduction in work-in-process value can be calculated by finding the difference in production time between the old and new processes and multiplying it by the value of each unit.
Old process time: 13 hours
New process time: 9 hours
Difference in time: 13 - 9 = 4 hours
The reduction in work-in-process value = Difference in time x Value per unit = 4 hours x $1,500 = $6,000