Step 1: Calculate the GST amount:

GST amount = (GST rate / 100) * MRP

GST amount = (12 / 100) * 5000

GST amount = 0.12 * 5000

GST amount = 600

Step 2: Add the GST amount to the MRP to get the amount payable:

Amount payable = MRP + GST amount

Amount payable = 5000 + 600

Amount payable = 5600

Sabina needs to pay Rs. 5600 for the dress, including the GST