If 0.25 a = 0.05 b, then which of the options below gives the bet approximation of the value of $$\frac{b-a}{b+a}$$​ ?

Correct option is C

Given:

0.25 a = 0.05b

Solution:

0.25a = 0.05b

25a = 5b

5a = b

Substituting the value of b in $$\frac{b-a}{b+a}$$​​

​$$= \frac{5a-a}{5a+a} = \frac{4a}{6a} = \frac{2}{3} =0.666.. \sim = 0.67$$​​