you notice your forecasts for the past serval periods have been incorrect. you want to correct the forecast for future calculations. using single exponential smoothing with a smoothing constant of 0.3, you decide to go back to january (your recalculation starting point). you have the following historical data:

January: Actual was 50 and Forecast was 60

February: Actual was 60 and Forecast was 70

March: Actual was 75 and Forecast was 80

what would the revised forecast be for april using single exponential smoothing?