Electricity tariffs are regulated by the Energy Market Authority (EMA) of Singapore and revised quarterly to reflect the actual cost of electricity.
The cost of electricity per kilowatt(kWh) is known as the electricity tariff rate, which is revised every quarter by SP power. Electricity Tariff Quarterly Household Electricity Tariff* (bar chart shown) Mr Faizal's average electricity consumption in January to March 2024 (table shown below).

(a)
Show that Mr Faizal paid $217 on average per month for his family consumption from January to March 2024.

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Worked solution

1. Find Mr Faizal's average monthly electricity consumption from January to March 2024.

Average monthly consumption
$=\frac{727+682+769}{3}$
$=\frac{2178}{3}=726\text{ kWh}$

2. Use the Jan--Mar 2024 tariff rate to find the average monthly cost.

From the bar chart, the Jan--Mar 2024 tariff rate is $29.89$ cents/kWh.

Average monthly cost
$=726\times 29.89\text{ cents}$
$=21694.14\text{ cents}$
$=\$216.9414\approx \$217$

Answer

Hence, Mr Faizal paid approximately $217 on average per month.

AI analysis — may contain mistakes.

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