$156,200 / 4 = (this is her expected average per season if seasons didn't exist).
She implemented the system. The following summer, she ordered 80 gallons of chocolate fudge instead of 40, and she didn't run out once. In winter, she launched a small hot cocoa and cookie menu (index 0.34 meant low volume, so she kept it simple). She stopped wasting money on full staff in January. how to calculate seasonal variation
"Finally," Leo said, "multiply that 'average season' by each Seasonal Index." $156,200 / 4 = (this is her expected