Answer:
The GDP for year 1, year 2, and year 3 is $12, $20 and, $30 respectively.
Step-by-step explanation:
The nominal GDP is the value of goods and services produced in an economy in a year.
Here, the economy produces only chocolate bars. So we can find nominal GDP by calculating the value of chocolate bars produced in each year.
Nominal GDP for year 1
=

=

=$12
Nominal GDP for year 2
=

=

=$20
Nominal GDP for year 3
=

=

=$30