A company uses exponential smoothing with trend to forecast monthly sales of its product, which show a trend pattern.
At the end of week 5, the company wants to forecast sales for week 6. The trend through week 4 has been twenty additional cases sold per week.
Average sales have been eighty-five cases per week. The demand for week 5 was ninety cases. The company uses α = 0.20 and β = 0.10. Make a forecast including trend for week 6.
The smoothing of the level of the series is____?