Amar sold a camera at 20% profit to Bhavan. Bhavan sold it to Chetan at 30% loss. Chetan bought the camera for Rs.840. find the cost price of Chetan, had Amar sold the camera to Bhavan at 30% loss and Bhavan sold it to Chetan at 20% profit (in Rs.) a)1160 b)1080 c)840 d)720