이항식 풀이 알려주실분

[jayden]

₩2,450,000=50% x A x ₩7,000,000+30% x(1-A) x ₩7,000,000

[나는 전설이다]

₩2,450,000=50% x A x ₩7,000,000+30% x7,000,000-30% × A x ₩7,000,000
350,000=1,400,000×A
A=0.25