Given the following table, determine the missing value. a. 64% c. 36% b. 64% d. 35.6% which one is correct?

We know that
Based on the table
Percent%=[1-Decay factor]*100%
so

for decay factor=0.98
Percent%=[1-0.98]*100%> 2%

for decay factor=0.50
Percent%=[1-0.50]*100%>50 %

for decay factor=0.64
Percent%=[1-0.64]*100%> 36%

for decay factor=0.23
Percent%=[1-0.23]*100%> 77%

therefore

the answer is
36%