sales in January. February, March were 300, 250, 350. The forecast for March was 300. Using simple exponential smoothing with a=0.4, what is the

sales in January. February, March were 300, 250, 350. The forecast for March was 300. Using simple exponential smoothing with a=0.4, what is the forecast for April?

a. 200

b.  320

c.  300

d.  340

e.  none of the above