Elena added every number: $60k + $20k + $10k + $30k + $70k + $25k + $12k + $35k = $262,000. She divided by 8 (the total number of seasons): $262,000 / 8 = .
And every year, she recalculated the indices using the latest three years of data, because seasons shift. A new boardwalk hotel opened, boosting spring sales. Her Spring Index crept up from 0.99 to 1.10.
He drew four boxes on the napkin. "First," Leo said, "write down your total sales for each season for the last two years."
"Now divide that total by 4 to get the 'average season' for next year," Leo said.
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