Question

TABLE 1: Pantsula's variable costs for calls made \begin{tabular}{|l|c|c|c|c|c|c|c|} \hline \begin{tabular}{l} Duration of calls \\ (in minutes) \end{tabular} & 0 & 100 & 120 & 150 & 200 & 240 & \( \mathbf{R} \) \\ \hline \begin{tabular}{l} Costs for landline to \\ landline (in rand) \end{tabular} & 0 & 0 & 0 & 0 & 40 & \( \mathbf{Q} \) & 120 \\ \hline \begin{tabular}{l} Costs for landline to \\ cellphone (in rand) \end{tabular} & 0 & 0 & 16 & \( \mathbf{P} \) & 80 & 112 & 160 \\ \hline \end{tabular} (a) Calculate the missing values \( \mathbf{P}, \mathbf{Q} \) and \( \mathbf{R} \). (b) The graph showing the variable costs for landline-to-cellphone calls has been drawn on ANNEXURE A. Draw, on the same ANNEXURE, the graph showing the variable costs for landline-to-landline calls. (4) (c) Determine Pantsula's total monthly costs if the owner used 200 minutes on landline-to-landline- and 140 minutes on landline-to-cellphone calls. Use the formula:

          TABLE 1: Pantsula's variable costs for calls made
\begin{tabular}{|l|c|c|c|c|c|c|c|}
\hline \begin{tabular}{l} 
Duration of calls \\
(in minutes)
\end{tabular} & 0 & 100 & 120 & 150 & 200 & 240 & \( \mathbf{R} \) \\
\hline \begin{tabular}{l} 
Costs for landline to \\
landline (in rand)
\end{tabular} & 0 & 0 & 0 & 0 & 40 & \( \mathbf{Q} \) & 120 \\
\hline \begin{tabular}{l} 
Costs for landline to \\
cellphone (in rand)
\end{tabular} & 0 & 0 & 16 & \( \mathbf{P} \) & 80 & 112 & 160 \\
\hline
\end{tabular}
(a) Calculate the missing values \( \mathbf{P}, \mathbf{Q} \) and \( \mathbf{R} \).
(b) The graph showing the variable costs for landline-to-cellphone calls has been drawn on ANNEXURE A. Draw, on the same ANNEXURE, the graph showing the variable costs for landline-to-landline calls.
(4)
(c) Determine Pantsula's total monthly costs if the owner used 200 minutes on landline-to-landline- and 140 minutes on landline-to-cellphone calls.

Use the formula:

TABLE 1: Pantsula's variable costs for calls made

Duration of calls

(in minutes)
0 100 120 150 200 240 𝐑

Costs for landline to

landline (in rand)
0 0 0 0 40 𝐐 120

Costs for landline to

cellphone (in rand)
0 0 16 𝐏 80 112 160

(a) Calculate the missing values 𝐏, 𝐐 and 𝐑.
(b) The graph showing the variable costs for landline-to-cellphone calls has been drawn on ANNEXURE A. Draw, on the same ANNEXURE, the graph showing the variable costs for landline-to-landline calls.
(4)
(c) Determine Pantsula's total monthly costs if the owner used 200 minutes on landline-to-landline- and 140 minutes on landline-to-cellphone calls.

Use the formula:

Added by Stephen C.

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