Question

Mr. Colin is trying to calculate his monthly electricity bill based on the information he has gathered as tabulated in Table 1. Table 1 shows the appliances and the total duration of usage by each appliance in a month. The electricity tariff charges are indicated in Table 2, ignoring all other charges,

1. Calculate what would be Mr. Colin electricity bill of the month.                         [10 Marks]                       

Table 1: List of Appliances

No	Equipment	Total duration of usage by each appliance per month (mins)
1	13 x 22W LED Lights @ 0.95 power factor	12,600
2	1 x 40W tungsten incandescent @ unity power factor	600
3	1 x 60W Fan @ 0.9 power factor	12,600
4	1 x 45W TV @ 0.95 power factor	8,400
5	1 x 2HP Aircond @ 0.72 power factor	11,250
6	1 x 1200W Washing Machine @ 0.75 power factor	1,350

Table 2: Normal Tariff

Tariff	Energy Rates
For the first 200kWh per month	21.80 sen/kWh
For the next 100kWh per month	33.40 sen/kWh
For the next 300kWh per month	51.60 sen/kWh
For the next 300kWh per month	54.60 sen/kWh
For the next kWh per month	57.10 sen/kWh

Answer 1