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1 152. 期初備抵呆帳-應收帳款為貸餘$4,200,調整後期末貸餘$5,800,期末提列呆帳$3,000,則本年度沖銷無法收回之帳款為
A $1,400
B $4,600
C $7,200
D $7,800