Use the Following Quarterly Data (Sales in Units)to Develop the Seasonal

Essay

Use the following quarterly data (sales in units)to develop the seasonal indexes:
$$\begin{array} { | c | r | r | r | } \hline \text { Quarter } & \text { Year 1 } & \text { Year 2 } & \text { Year 3 } \\\hline 1 & 51 & 62 & 74 \\2 & 103 & 124 & 133 \\3 & 172 & 199 & 222 \\4 & 296 & 332 & 367 \\\text { Total } & 622 & 717 & 796 \\\hline\end{array}$$
The manager predicts that the demand for next year will be 900.What are the quarterly forecasts for next year?