Landfill expenses depend on estimates that may change from year to year.

In 2020 Marquette County opened a landfill that was expected to accept waste for four years. The following table indicates the estimates county officials made at the end of each of the four years:

Year / Total Capacity (millions of cubic feet) / Capacity Used This Year (millions of cubic feet) / Expected Closure Costs (millions of dollars) /

2020 10 4 $ 8

2021 10 2 $ 9

2022 12 2 $10

2023 12 4 $10

Determine the total expected closure costs ($10 million) that should be assigned to each of the years that the landfill accepts waste.