Please help me understand the reason for the answer of the following question which is the 29th question on the pg - 244 in the Schweser Notes June-Dec 2018 :
Portfolio A has a safety-first ratio of 1.3 with a threshold return of 2%. What is the shortfall risk for a threshold return of 2% ?
A. 9.68%
B.40.3%
C.90.3%
Answer - A
What is the reason for this answer ?