Your firm's last three years of sales have been $1 million, $2 million, and $3 million (oldest to most recent). year-end inventory was $250k, $500k, and $750k respectively. you are considering purchasing an inventory system that will double your inventory turnover. which of the following is a good estimate for the amount you'll save with regard to inventory investment next year, assuming your sales will be $4 million - i. e., what's the difference between your estimates of inventory with the system and without? (assume that your costs of goods sold stay at a constant percentage of sales throughout the past three years and next year; use same-year cogs/inv as your inventory turnover formula.)