A.1000 B.2000 C.500 D.1500
A.75%金+25%銀 B.75%金+3.6%銀+21.4%銅 C.75%金+25%銅 D.95%金+5%銀
A.75%金+25%銅 B.75%金+21.4%銀等 C.75%金+3.6%銀等 D.75%金+25%銀