every year, danielle santos sells 47,360 cases of her delicious cookie mix. it costs her $2 per year in electricity to store a case, plus she must pay annual warehouse fees of $3 per case for the maximum number of cases she will store. if it costs her $740 to set up a production run, plus $7 per case to manufacture a single case, how many production runs should she have each year to minimize her total costs?