Answer:
a) 計 -> 古 -> 員 -> 財
計 KEI, haka(ru), haka(rau) - plan, total, measure
古 KO, furu(i) - old
員 IN - member
財 ZAI, SAI - money, wealth, property
b) 章 -> 古 -> 員 -> 賦
章 SHOU - chapter, badge, mark
古 KO, furu(i) - old
員 IN - member
賦 FU - tribute, payment, installment