To solve for the percentage increase in school enrollment[tex]\mathsf{Percent\ Increase = \left( \dfrac{New\ -\ Old}{Old} \right) \times 100}[/tex][tex]\mathsf{= \left( \dfrac{1954 - 1200}{1200} \right) \times 100}[/tex][tex]\mathsf{= \left( \dfrac{754}{1200} \right) \times 100}[/tex][tex]\mathsf{= 0.6283 \times 100}[/tex][tex]\boxed{\mathsf{62.83\%\ increase}}[/tex]Therefore the school's enrollment increased by 62.83%.