13. A has to pay Rs. 220 to B after 1 year, B asks A to pay Rs. 110 in cash and defer the payment of Rs. 110 for 2 years. A agrees to it. Counting, the rate of interest at 10% per annum in this new mode of payment:

14. The true discount on Rs. 1860 due after a certain time at 5% is Rs. 60. The time after which it is due is:

15. Goods were bought for Rs. 600 and sold the same day for Rs. 650.25 at a credit of 9 months and still there was a gain of 2%. The rate percent is: