Minimum GST cash after credit set-off

For the month, output liability is IGST ₹50,000, CGST ₹30,000 and SGST ₹30,000. Available credit is IGST ₹70,000, CGST ₹10,000 and SGST ₹25,000. Using credits in the legally allowed order, what is the minimum GST payable in cash?