Question $45$

$1$ pts

Table $10-5$

The following table shows the marginal costs for each of four firms $,$ and $D$ to eliminate units of pollution from their production processes. For example, for Firm A to eliminate one unit of pollution, it would cost $$54,$ and for Firm A to eliminate a second unit of pollution it would cost an additional $$67.$

$\backslash$table$[[$Firm$,$Marginal Cost to Eliminate $($Dollars$),],[$First Unit,Second Unit,Third Unit,Fourth Unit$],[$A$,54,67,82,107],[$B$,57,68,86,108],[$C$,54,66,82,107],[$D$,62,73,91,111]]$

Refer to Table $10-5.$ If the government charged a fee of $$84$ per unit of pollution, how many units of pollution would the firms eliminate altogether?

$10$

$9$

$8$

$7$