Ace investor Rakesh Jhunjhunwala has pledged to donate 25 per cent of his holdings or Rs 5,000 crore (whichever is less) for charity by July 2020, when he turns 60. Currently, the value of Jhunjhunwala’s portfolio is around Rs 7,500 crore, a fourth of which is about Rs 1,876 crore, reports Samie Modak