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Her electricity bill will be of 14256 pence.
<em><u>Explanation</u></em>
On average, Tanya uses 90 units of electricity per week.
So, the <u>total units of electricity in 12 weeks</u> will be: units
One unit of electricity costs 13.2 pence.
Thus, <u>the total cost for 1080 units</u> will be: pence.
So, her electricity bill will be of 14256 pence.