Phillips Company manufactures air-conditioning units for commercial buildings and has noticed considerable variation in shipping expenses from month to month as per the data below: Month Units Total Shipping Shipped Expense January 4 February 4 March 5 April 2 May 3 June 6 July 8 SSSSSS 1,600 2,500 1,850 1,200 1,740 2,100 2,880 10. Given the facts in part 3-8, if total fixed costs (excluding shipping) are $1,000 per month, estimate operating income for August if seven air conditioners are produced and sold.