Prasad moves towards North a distance of 10 km after which, he turns towards East and travels 20 km at which point, he turns South and continues for another 10 km. Finally, he moves 7 km West. How far is he from the starting point?
The simple and compound interest that can be earned in two years at the same rate is Rs 1500 and Rs 1575 respectively. What is the rate (% per annum) of interest?