Capital investment in US based Equity fund (t0) = $ 71,428.57
Investment Value (t1) = (71,428.57 x 15%) + 71428.57 = 82,142.86
Investment value in Indian Rupee = 82,142.86 x 65 = 53,39,285.62
Return in Rupee term = Rs. 53,39,285.62 – Rs. 50,00,000 = Rs. 3,39285
i.e. 6.79 % and not 15%