Tax collected at the time of purchase = Rs 12,500
∴ Amount of ITC to be claimed by Nazama = Rs 12,500
Tax collected at the time of sale = Rs 14,750
∴ GST payable = Tax collected at the time of sale − Tax collected at the time of purchase = Rs 14,750 − Rs 12,500 = Rs 2,250
Thus, the amount of GST payable by Nazama is Rs 2,250.