Formulae and Questions of Percentage 1. Concept of percentage or Percentage formula To express x% as a fraction: We have, x% x/100 Thus, 30%=30/100= 3/10 In simple terms we can conclude that percentage symbol "%" means 1/100 In case we are having a fraction and we have to calculate its percentage then we will multiply it by 100. that is, a/b=(a/b)×100)% 2. Increase or decrease in percentage with price (1 ) If the price of a commodity increases by R%, then the reduction in consumption so as not to increase the expenditure will be = [R/ (100+R)×100]% ( 2 ) If the price of a commodity decreases by R%, then the increase in consumption so as not to decrease the expenditure will be = [R/(100−R)×100] 3. Results on population Formula's on result of population are very important when we have to calculate the population n years after or n years before, Let the population of a town be P now and suppose it increases at the rate of R% per annum, then (1 ) Popu...
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