A bank offers 20% compound interest per half year. A customer deposits Rs 2800 each on 1st January and 1st July of a year. At the end of the year, the amount he would have gained by way of interest is ______.
I hire a taxi from my home to go to my workplace. The fare system in the city is such that for the first kilometre, I am charged Rs 25, and after that, I am charged Rs 6 per kilometre. If my workplace is 10 km far from my home, what amount do I have to pay if I go by taxi?