초기값(hidden)처리
selector1 :
selector2 :
selector3 :
selector1
옵션1(1000)
옵션2(2000)
옵션3(3000)
selector2
Selector3 option 모두있음
Selector3 옵션3(3000) 제거
selector3 (selector2 값에 따라 변경)
옵션1(1000)
옵션2(2000)
옵션3(3000)
TOTAL_VAL