Due to illness the weight of a person has reduced from 80 kg to 64 kg in a month. The percent decrease in the weight of the person is:

Correct option is D

Given:
Initial weight = 80 kg
Final weight = 64 kg
Formula Used:
Percentage decrease = $$\frac{\text{Initial value} - \text{Final value}}{\text{Initial value}} \times 100$$​​
Solution:
Percentage decrease in weight = $$\frac{80 - 64}{80} \times 100 = 20\%$$​​