A family paid 12 percent of its annual after-tax income on food last year. The amount was equal to 10 percent of its annual before-tax income last year. Which of the following is closest to the percent of the family's annual before-tax income that was paid for taxes last year?
(답: 17%)
어떻게 식을 세워서 풀어야 할 지..
제발 알려주시길 부탁드려요ㅠㅠㅜㅜ