Hello today we look at percentage increase and decrease what do you mean by this statements A is 25% taller, sales of the company decreased by 15%, X scored 30%, Y scored 20% does these statement makes any meaning no why because the comparison is missing A is 25% taller than whom, sales of the company decrease by 15% with respect to what so now if I write down A is 25% taller than B compared to last year, sales of the company decreased by 15% over last year than the expectation does it make sense yes similarly X scored 30% out of 50 in only section 1 and Y scored 20% out of 200 of the total they are meaningful statements so the base the comparison is very very important now if we look at A is 25% taller than B what is my base here B there are various approach to simply solve this question lets go ahead with first method that is method of base 100 so if you assume that height of B is 100 then A will be 25 more than 100 which means A is 125 clear everyone if we go ahead with the second method which is multiplying factor if I assume the height of B as B then height of A would be 1.25 times of B clear the second method let’s look at some other example A is 5.88% taller than B what is my base here B so what is my first method base 100 if we assume height of B is 100 then height of A would be 5.88 more than 100 that is nothing but 105.88 is that scary because 105.88 working with decimal correct and if you look at the second method that is multiplying factor over there we assume the height B as B then the height of A will becomes 1.0588 times of B my god you can just imagine the level of calculation correct so to simplify this if the percentages are keyds will use the next two methods