Neco 2022 Data Processing Question 25

A spreadsheet records monthly sales (in units) for three products over six months as follows:\n\n\begin{tabular}{c|cccccc}\nMonth & Jan & Feb & Mar & Apr & May & Jun \\ \hline\nProduct A & 120 & 150 & 130 & 160 & 140 & 155 \\nProduct B & 80 & 95 & 85 & 90 & 100 & 110 \\nProduct C & 200 & 210 & 190 & 205 & 195 & 215 \\n\end{tabular}\n\n(a) What is the total sales for the six‑month period?\n(b) Which product contributes more than \(40\%\) of the total sales?\n(c) Using the formula \(\frac{S_{last}-S_{first}}{S_{first}}\times100\%\), where \(S_{first}\) and \(S_{last}\) are the sales of the product identified in part (b) in January and June respectively, compute its average monthly growth rate (in %).