QUESTION $11$

In the Example of Determining Seasonal Index, data from the past $3$ years, by month, are available, and seasonal indices are developed as follows:

DEMAND

MONTH

YEAR $1$

YEAR $2$

YEAR $3$

AVERAGE PERIOD DEMAND

AVERAGE MONTHLY DEMAND

SEASONAL INDEX

Jan

$80$

$85$

$105$

$90$

$94$

$\mathrm{.}957(=90/94)$

Feb

$70$

$85$

$85$

$80$

$94$

$\mathrm{.}851(=80/94)$

Mar

$80$

$93$

$82$

$85$

$94$

$\mathrm{.}904(=85/94)$

Apr

$90$

$95$

$115$

$100$

$94$

$1\mathrm{.}064(=100/94)$

May

$113$

$125$

$131$

$123$

$94$

$1\mathrm{.}309(=123/94)$

June

$110$

$115$

$120$

$115$

$94$

$1\mathrm{.}223(=115/94)$

July

$100$

$102$

$113$

$105$

$94$

$1\mathrm{.}117(=105/94)$

Aug

$88$

$102$

$110$

$100$

$94$

$1\mathrm{.}064(=100/94)$

Sept

$85$

$90$

$95$

$90$

$94$

$\mathrm{.}957(=90/94)$

Oct

$77$

$78$

$85$

$80$

$94$

$\mathrm{.}851(=80/94)$

Nov

$75$

$82$

$83$

$80$

$94$

$\mathrm{.}851(=80/94)$

Dec

$82$

$78$

$80$

$80$

$94$

$\mathrm{.}851(=80/94)$

Total average annual demand $=$

$1,128$

If next year$$s annual demand is $1,150($instead of $1,200),$ what will the March forecasts be$?$