Inventory problem

Its 416000....as follows:

Goods balance on 24th - 400000

goods returned - 100000*25/125*20% - 16000

total 416000

please work out my problems:

the cost of verification inventory valu is on 24th march,07 was 400000.goods are sold at a profit of 25% on cost.on 21st march,goods on the sale value of 100000 were sent on sale or return basis to a customer,the period of approval being two weeks.he approved 80% of the goods on 31st march.the cost of inventory as per books is ---

a).480000                                                                                                                                                                  b).416000

c).428000                                                                                                                                                                   d).none of these.