JOHNSON HAS THE FOLLOWING INFORMATION FOR THE LAST 4 MONTHS: MONTH UNITS TOTAL COSTS MAY 7,870 $581,510 JUNE 7,850 $581,750 JULY 8,240 $606,940 AUG 8,320 $607,600 USING THE HIGH/LOW METHOD, ESTIMATE TOTAL COSTS AT 9,500 UNITS. (4 POINTS) ESTIMATED TOTAL COSTS