Answer and Explanation:
The computation of productivity is shown below:-
Blahnik Productivity Amount
Year 2021 100 (3,000 ÷ 30)
Year 2051 120 (3,600 ÷ 30)
So the value of Blahnik Year 2021 productivity is 100
and
the value of Blahnik Year 2051 productivity is 120
Gribinez Productivity Amount
Year 2021 80 (2,400 ÷ 30)
Year 2051 120 (3,600 ÷ 30)
So the value of Gribinez Year 2021 productivity is 30
and
the value of Gribinez Year 2051 productivity is 120