10. The Amstrong Co.'s sales and expenses for last year appears below; Sales Variable expenses Contribution margin Fixed expenses Net operating income Total Per Unit $ 500,000 $ 50 $ 150,000 $15 $ 350,000 $ 35 $ 190,000 $ 160,000 How much would dollar sales (round off to 2 decimal places) have to be to accomplish a target profit of $210,000