Through Some Tasty Culinary Investigation,Chef Willie Has Found the Difference

Multiple Choice

Through some tasty culinary investigation,Chef Willie has found the difference threshold for the sweetness of sugar in a cake.For a cake with 100 mg of sugar,the difference threshold is 5 mg.Based on this information,how much sugar would need to be added to a cake already con- taining 250 mg of sugar in order to make it taste just noticeably sweeter.(Assume Weber's law applies. )

A) 5 mg
B) 10 mg
C) 12.5 mg