jdeelc
18.03.2021 •
Mathematics
1.2. The power 4 is the tariff name used by the supplier. Consider the table below for the tariff paid
by a customer who uses an average of 400 kWh per month in 2017/2018 and 2018/2019.
Home power 2017
Monthly amount
payable in 2018/2019
Amount payable
Blocks
0-50KWh
51-350 KWh
351-600 KWH
>600 kWh
Monthly amount Home power
payable in 2017/2018 2018/2019
Amount payable (R) Blocks
30.42
225.27
55.71
0-600 kWh
0.00
>600 kWh
Network charge
311.40
Sub total
A
VAT
B
Total payable
77.85
Sub total excl VAT
VAT
Total payable inc VAT
Average c/kWh exc VAT
328.32
0.00
64.50
392.82
58.92
451, 74
с
1.
2.
N.B. VAT is charged at 15%
Determine the values of A and B on the table.
Calculate the value of C if the represents the average of the four blocks.
What is the percentage increase in prices from 2017/18 to 2018/19?
Write down the equation of the cost (C) of the above amounts using the average c/kWh in
relation to the consumption for each amount payable (n).
3.
4.
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Ответ:
Ans: (-3, 6)
Step-by-step explanation:
. You can substitute that into the first equation and get 7x+3y=-3 is the same as 7x+3(-2x)=-3 is the same as 7x-6x=-3 which is equal to x=-3. Plugging that into the second equation, you will get y=6, so the answer is (-3, 6).