A dealership purchased a car and a truck and then sold them both. The purchasing cost of the truck was $8,000 greater than the purchasing cost of the car, and the selling price of the truck was $12,000 greater than the selling price of the car. The profit that the dealership made on the car was equal to 20 percent of its purchasing cost, and the profit that the dealership made on the truck was equal to 30 percent of its purchasing cost. If x is the purchasing cost, in dollars, of the car, then x satisfies which of the following equations? (Note: Profit equals selling price minus purchasing cost.)
A0.3x+8,000=0.2x+12,000
B1.3x+8,000=1.2x+12,000
C0.3(x+8,000)=0.2x+12,000
D1.3(x+8,000)=1.2x+12,000
E1.3(x+8,000)+12,000=1.2x
답은 D 입니다...
제가 풀이 한것은 ...
profit = selling price - purchasing cost 이니까 D에서 왼쪽에 있는 1.3(x+8000)이 트럭의 profit 이라면 오른쪽에 나오는 식은 selling price of truck - purchasing cost of truck 이어야 하는거 아닌가요 ??? 이 문제 하나가지고 한시간은 버린것 같아서 너무 짜증나네요 ㅠㅠ ㅠ ㅠ ㅠ ㅠ ㅠ ㅠ ㅠ도와주세요 아주 자세한 풀이 부탁드립니다 이해를 아예 못한거일수도 ...