Interesting that in Mumbai someone who just reaches the top 1% of earners must pay 44% of their income to send one child to a private school, while in Australia it is only 8%.
I am not sure if that number is accurate (or which super-exclusive school they've taken as reference). Private School fees depend on the institution and the grade you're in, and varies from $5-25K.
Given the population size and density, competition is not nearly the same, and hence, top education is probably more expensive compared to the local wealth in India.