862: A man's investment doubles in every 5 years. If he invested Rs. 5,000 in each of the years 1990, 1995, 2000 and 2005, then what was the total amount received by him in 2010?
(a) Rs. 1,40,000
(b) Rs. 30,000
(c) Rs. 70,000
(d) Rs. 1,50,000
863: Which one of the following is an artificial lake ?