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math GCSE pastpaper problem :S

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 :biggrin:
1200×11+x=1212.50×121200 \times 11 + x = 1212.50 \times 12

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