An auto supplies company has retail stores located in eight cities in California. The price they charge for a particular product in each city varies because of differing competitive conditions. For instance, the price they charge for a case of a popular brand of motor oil in each city follows. Also shown are the number of cases that the company sold last quarter in each city. City Price ($) Sales (cases) Bakersfield 34.99 551 Los Angeles 38.99 1,375 Modesto 36.00 384 Oakland 33.59 782 Sacramento 40.99 815 San Diego 38.59 1,008 San Francisco 39.59 1,554 San Jose 37.99 889 Compute the average sales price per case for this product during the last quarter. (Round your answer to two decimal places.) $