1. The value of auto rickshaw gets depreciated by 20% per year. what would be its estimated value at the end of 5 years if the present value is Rs. 24000.

2. Find the nth term of 0.4, 0.44, 0.444, .......

3. The monthly salary of a person was Rs. 320 fro each of the first three years. He got annual increment of Rs. 40 per month for each of the following successive 12 years. his salary remained stationary till retirement when he found that his average monthly salary during his service period was Rs. 698. Find the period of service