Landfill expenses depend on estimates that may change from year to year. In 2017 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 Capactiy (millions of cubic feet)	Capacity used this year	expected closure costs
2017	10	4	8
2018	10	2	9
2019	12	2	10
2020	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.