[tex]4*100=400 -value \ of \ the \ four \ test \\ \\ 90 \% \ of \ 400= \frac{90}{100}*400=90*4=360 \ points \ is \ the \ minimal \\ \\ 89+92+81=262 -\ for \ the \ 3 \ test \\ \\ 360-262=98 \ points \ you \ have \ to \ take \ at \ the \ 4th \ exam[/tex]