a$.$ Using a simple three$-$month moving average, what is the forecast for September?

b$.$ Using a weighted moving average, what is the forecast for September with weights of $0\mathrm{.}20,0\mathrm{.}30,$ and $0\mathrm{.}50$ for June, July, and August, respectively?

c$.$ Using single exponential smoothing and assuming that the forecast for June had been $130,$ forecast sales for September with a smoothing constant alpha of $0\mathrm{.}30.$