1- After you solve step change cost of goods sold for 2021 into your first 7 digital number of your student number (1 mark)

Example, your student number is 442350428 take just 4423504

Then solve again by new number

1- After you solve step change cost of goods sold for 2021 into your first 7 digital number of your student number ( 1 mark) Example, your student number is 42350428 take just 4423504 Then solve again by new number