Pure Nater Products produces three types of water filter: a faucetmounted filter, a pitcher-filter, and an under-sink filter, Revenue and cost information for each product appears below: - the faucet-mounted filter is sold for $51 per unit and has variable costs of $24 per unit - the pitcher-filter sells for 562 per unit and has variable costs of 548 per unit - the under-sink filter has a selling price of $39 per unit and has variable costs of $11 per unit. - fixed costs total 5183,940 per year During the most recent year, Pure Water Products sold 3,200 faucet-mounted ftters, 6,800 pitcher-filters, and 5,400 of the under-sink filters. Calculate the number of units of the under-sink filter product that needed to be sold in the most recent year in order for Pure Water Products to earn a profit equal to $108,160