Cpt i need help in this question

X sent out goods costing Rs.80000 to Y as to show 20% profit on invoice price. 40% goods were lost in transit. 60% of goods received were sold half at invoice price and the balance at 25% above invoice price. Rate of commission is 10% on sales at invoice price plus 50% of gross sales less all commission exceeds the invoice price. the amount of commission would be: A. Rs.3600 B. Rs.3900 C. Rs.8100 D.None