[질문] 비교내신계산방법은??

1학년 {[{(200-(6÷ 300×200))+(200-(10÷ 300×200))+(200-(5÷ 300×200)+(200-(7÷ 300×200))+(200-(7÷ 300×200))+(200-(5÷ 300×200))}÷6]×0.4} = 78.222