Please help me in solving one consignment problem.

new user (student) (59 Points)

10 August 2009  
X of kolkata sends out goods costing rs 1,00,000 to y of delhi.3/5 th of the goods were sold by consignee for rs 70,000.Commission 2% on sales plus 20% on gross sales less all commission exceeds cost price.The amount of commission will be? A.Rs.2833 B.Rs.2900 C.Rs.3000 D.Rs.2800. The answer is A.Rs.2833. Can any1 explain me how to solve these problem?