The given pie charts show the distribution of students studying different disciplines in an institute, in 2019 and 2021. The total number of students in 2021 is 20% more than that in 2019. Study the charts and answer the questions that follow.
The ratio of males and females students studying Computer Science in 2019 is 3 : 4 and it is 7 : 5 for the students studying Management in the same year. 30% of the students studying Management in 2021 are females. The number of male students studying Management in 2021 is what percentage less than the total number of female students studying Computer Science and Management in 2019?