Contact us
Choose a category below so we can get back to you as quickly as possible.
設原價是1,則:1×(1-20%)×(1-30%),=1×80%×70%,=0.56;(1-0.56)÷1,=0.44÷1,=44%;答:現在這種商品的價格比原來降低了44%.故選:B.
We and our partners use cookies and other technologies to analyze traffic and optimize your experience. View more info and control your cookies settings at any time in our Cookies Policy.