Tech magnate Azim Premji may be India’s second wealthiest man, but he certainly takes the top spot as the country's most charitable person, hitting headlines in March for his huge $7.5 billion (£5.8bn) donation to charitable causes. This takes his total philanthropic contribution to a staggering $21 billion (£16.3bn). But how did Premji go from a college dropout to India's very own Bill Gates? Let’s take a look.