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Question 19

A rule to calculate the monthly cost of an electricity bill, in pounds (£\pounds£), is:

Multiply the number of units used by 0.15 then add 12

a.

A customer uses 400 units of electricity in a month.

Work out the monthly cost, in pounds (£\pounds£).

[2]
b.

The monthly cost for a different customer is £36\pounds36£36.

Work out the number of units of electricity used.

[2]

Function Machines Questions

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