Refund claim inverter tax structure _Input credit

The formula is quiet complicated cannot be explained on this form u need to check for urself u'll understand

As per Rule 89(5) of CGST Act read with Notification 21/2018 CT :
Maximum Refund Amount =(Turnover of Inverted rated supply of Goods) X Net ITC ÷Adjusted Total Turnover.

Now putting above formula :. Suppose
Raw Material (Inward supply) 100 input :12
Fabric (outward supply ) : 150 Output : 7.5

Maximum Refund :( 150 X 12) ÷ 150 - 7.5 = 4.5

Note : No Refund is permissible for accumulated credit on Input Services