please help

Assume a merchandising company uses the high-low method to separate any mixed costs into their variable and fed elements. It provided the following income statements May 4,800 $ 168,000 86,400 81,600 June 5.000 $ 175,000 90,000 85,000 July 5,500 $ 192,500 99,000 93,500 Sales in units Sales Cont of goods sold Gross margin Selling and administrative expenses Advertising Shipping Salaries and commissions Total selling and administrative expensen Net operating income 17,000 16,800 29,600 63,400 $ 18,200 17,000 17.500 30.000 64,500 $ 20,500 17,000 19.250 31.000 67,250 $ 26,250 What is the estimated shipping expense if the company sells 5,400 units