What will be outcome of below KF calculation

CUMU_DEMAND@PERPRODCUST = IBP_CAGGR("DEMAND@PERPRODCUST",''SUM'',''BACKWARD'',''CURRENT'')

Demand KF has NULL values except below Periods

Period -2=10

Period-1=20

Period 0=30

Period 1=40

Period 2=50

What will be outcome of CAAGR KF in Period 1 (First Future Bucket)?

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