Quant Quiz SSC CGL Tier-II 2016

Q1. A ruby stone was bought for Rs.1600 at Jaipur. A sum of Rs.2400 was spent on making a ring with the ruby stone. It was advertised for sale of Bombay for Rs.7800. If a discount of 10% was given, then the percentage profit made was:
(a) 55%
(b) 68.5%
(c) 75.5%
(d) 80%