[질문] 내신석차등급구하는방법알려주세요

1등급:4%/2등급:11%/3등급:23%/4등급:40%/5등급:60%/6등급:77%/7등급:89%/8등급:96%/9등급:100%/예를들어전교생240명중42등이면(42/240)*100=17.5(%)이므로3등급