2025 SST PRELIMS P1 Q9

2025 SST PRELIMS P1 Q9

Secondary 4
3 marks

Diana has two outlets that sell donuts of three flavours. The numbers sold over a two-hour period are represented by matrix D.

BlueberryChocolateApple
Outlet 1\(75\)\(86\)\(48\)
Outlet 2\(108\)\(56\)\(36\)
  1. Blueberry, chocolate and apple donuts sell for $3.50, $4.50 and $2.50 respectively. Represent the selling prices in a \(3\times1\) column matrix \(P\).[1]
  2. Evaluate \(M=DP\).[1]
  3. Explain what each element of \(M\) represents.[1]

Solution:

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Answer:(a) \(\begin{pmatrix}3.50\\4.50\\2.50\end{pmatrix}\) (b) \(\begin{pmatrix}769.50\\720.00\end{pmatrix}\) (c) outlet revenues

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