Question

. In the preceding problem, using sensitivity analysis, if the productivity ratio was 13.1 the previous month, has productivity increased or decreased? By what percentage?

I am having a hard time understanding how the book came up with these answers. need it worked out so I understand the process

Productivity has decreased by 6.9% from the previous month.

The problem before this was

Based on the following data, calculate the single-factor productivity ratio using hours of labor for a housekeeping department. • Number of employees = 100 • Average hourly rate = $5.50 • Total hours worked in September = 15,570 • Total square feet maintained = 190,000

The single-factor productivity rate is 12.2 (190,000 square feet ÷ 15,570 hours worked).