goal seek in excel

Management is getting excited about launching into the new market segment. However, they still have their head screwed on a little.... They have asked you to let them know how many liters of Blue Goo must be sold so that total costs are $33,796. For this, you have been given the following information: . Fixed Cost = $20,177 Variables costs = $16.83 per liter Anticipated sales price = $29.93 Incentive discount = 4% . Calculate how many liters of Blue Goo must be sold to achieve that targeted total cost