A 150 mL of solution of I2 is divided into two unequal parts. I part reacts with hypo solution in acidic medium. 15 mL of 0.4 mL of 0.4 M hypo was consumed. II part was added with 100 mL of 0.3 M NaOH solution. Residual base required 10 mL of 0.3 M H2SO4 solution for complete neutralization. What was the initial concentration of I2 ?