If the normality of HCl is greater by 10% compared to KOH, estimate the normality of the HCl solution when 0.67 gram of (NH4)2SO4, is dissolved in water, treated with excess NaOH and the ammonia released is passed through a solution of 20 ml of HCl. The excess acid solution is titrated using 15.01 ml of KOH solution.

a. 0.275 N

b 3.17x10^-3 N

c. 0.152N

d. 2.32x10^-2 N