Suppose that a simple exponential smoothing model is used $($with $\backslash$alpha $=0\mathrm{.}40)$ to forecast monthly sandwich sales at a local sandwich shop. The forecasted demand for September was $1560$ and the actual demand was $1480$ sandwiches. Given this information, what would be the forecast number of sandwiches for October?

a$.1560$

b$.1480$

c$.1592$

d$.1528$