Here, \( \Large r_{1} \) = 20% and \( \Large r_{2} \) = 5%

Therefore, Required percentage

= \( \Large \left(r_{1}+r_{2}-\frac{r_{1} \times r_{2}}{100}\right) \)%

= \( \Large 20+5-\frac{20 \times 5}{100} \) = 25 - 1 = 24%