Vasu invested some amount at the rate of 15% simple interest and the remaining at 18%. He received yearly an interest of Rs. 33. Had he interchanged the amounts invested, he would have received the same rate of interest. How much money did he invest at different rates?
1
Rs. 100 at the rate of 15%, Rs. 400 at the rate of 18%
2
Rs. 100 at the rate of 15%, Rs. 100 at the rate of 18%
3
Rs. 800 at the rate of 15%, Rs. 400 at the rate of 18%
4
Rs. 500 at the rate of 15%, Rs. 500 at the rate of 18%