TS Is an 80-Year-Old Female Admitted to the Hospital with an Exacerbation

TS is an 80-year-old female admitted to the hospital with an exacerbation of COPD. She was diagnosed with the disease 20 years ago and now complains of shortness of breath while eating and drinking.
HT: 5'1"          WT: 104 pounds          UBW: 115 pounds
-What percent weight loss has TS experienced?

A) 7.8%
B) 8.3%
C) 9%
D) 9.6%
E) 10.5%