<prompt> Translate the following text to EnglishUnaweza kufanya makadirio ya jumla ya gharama hii kwa kila uchafuzi, juu ya gharama zinazohusiana na tatu nyingine, kwa kuzidisha nusu ya gharama ya marginal kwa gharama ya wastani ya takriban kwa kiasi cha kupunguza.  <response>: One can make a very rough estimation of this overall cost for each pollutant, on top of the costs associated with the other three, by multiplying half the marginal cost to approximate average cost by the volume of reductions. 