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Hi Shalu
What do you want us to explain. We have videos on each and every topic which will clear your doubts, so I would suggest you to subscribe to our video course. If you have doubt in any particular question then feel free to post it here and we will be ready to help. However, explaining 5 topics here is not feasible. Anyway, I'll try and give a short description of all the 5 topics you mentioned.
Percentage means per hundred. So it is nothing but writing anything in terms of its value out of 100. Say somebody scores 400 out of 500 marks. Then % = 400*100/500 = 80
SI = P*R*T/100 =>
For CI, Amount after n years = P(1+r/100)^n
Average is nothing but the some of all quantities divided by the total number of quantities.
Hope that helps
Thanks
