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To calculate the next forecast, you use the weighted average form of the exponential smoothing formula: $F_{t+1} = \alpha A_t + (1 - \alpha)F_t$. With a smoothing constant of $\alpha = 0.2$, the formula becomes $F_{t+1} = 0.2(A_t) + 0.8(F_t)$.

Conditions: The smoothing constant is $\alpha = 0.2$.; You know the actual sales value for the current period ($A_t$).; You know the forecast value for the current period ($F_t$).

To calculate the next forecast, you use the weighted average form of the exponential smoothing formula: $F_{t+1} = \alpha A_t + (1 - \alpha)F_t$. With a smoothing constant of $\alpha = 0.2$, the formula becomes $F_{t+1} = 0.2(A_t) + 0.8(F_t)$.

Conditions: The smoothing constant is $\alpha = 0.2$.; You know the actual sales value for the current period ($A_t$).; You know the forecast value for the current period ($F_t$).