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Mathematics, 28.11.2021 23:50 cooper2017

In 2014, Sally used 5400 units of electricity. In 2015, the price of electricity increased by 8% but Sally reduced her usage to 4500 units.
Sally paid £680.40 for the units she used in 2015.
Did she pay more or less for the units she used in 2014? Show your working.

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