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math GCSE pastpaper problem :S Watch

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    hey i came across this whilst working a gcse patpaper can anyone help ?
    frank works out that his mean monthly salary for the year 2008 was €1212.50. from january to november he was paid €1200 per month . what increase was he given in the december salary ?
    anyhelp is greatly appreciated
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    1200 \times 11 + x = 1212.50 \times 12
 
 
 
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