Acme Foods Wants to Make Its Chips Saltier, but It

Multiple Choice

Acme Foods wants to make its chips saltier, but it doesn't want to spend more than it has to on salt. A sample of consumers is asked to compare its current chips variety (saltiness = 100) with saltier versions and to say whether the new versions are saltier. On an average, sample consumers reliably say that a new chips variety is saltier when its saltiness value is 108, but not when its saltiness value is below 108. Assuming Acme Foods' sample consumers are representative of people in general, which of the following percentage values best represents the just noticeable difference for saltiness?

A) 8%
B) 108%
C) 80%
D) 100%