Measurement, STD2 EQ-Bank 25

The table compares the fuel costs of a petrol car with an electric car.

\begin{array} {|l|l|l|}
\hline
\rule{0pt}{2.5ex} \rule[-1ex]{0pt}{0pt} & \textit{Petrol car} & \textit{Electric car}\\
\hline
\rule{0pt}{2.5ex}\text{Fuel consumption}\rule[-1ex]{0pt}{0pt} & \text{8.6 L/100 km} & \text{18 kWh/100 km} \\ \hline \rule{0pt}{2.5ex}\text{Cost of fuel}\rule[-1ex]{0pt}{0pt} & \text{\$1.87/L} & \text{\$0.25/kWh} \\ \hline \end{array}

Jun travels on average 35 000 km per year.

How much will he save on fuel costs in a year by using an electric car? (3 marks)

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$$4053.70$

Show Worked Solution

$\text{Petrol car fuel costs}$

$\text{Litres used}=\dfrac{8.6\times 35\ 000}{100}=3010\text{ L}$

$\text{Cost of fuel}=3010\times $1.87 = $5628.70$

$\text{Electric car power costs}$

$\text{kWh}=\dfrac{18\times 35\ 000}{100}=6300\text{ kWh}$

$\text{Cost of power}=6300\times $0.25 = $1575$

$\text{Saving}=$5628.70-$1575=$4053.70$