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Example 14 : The salary of a technician has been increased by 30%. By what per cent must the newsalary by reduced to restore the original salary? |
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Answer» We can calculate consecutive impact of % change using a simple FORMULA. SUPPOSE we have two CHANGES x% and y% CONSECUTIVELY , so the total impact will be(x)+(y)+{(x)*(y)/100} %.If x or y is percentage increase in quantity then TAKE +x or +y like (+x) or (+y) . For decrease take them (-x) and (-y). The symbol of + or - in answer indicate Increase or decrease respectively.Decrease is 50% that is -50 and Increase is 50% that is +50 ; henceChange = -50+50+{(-50 * +50)/100} %= -250/100 %= -25 %Impact is -vehence loss = 25%We can calculate the following using formula :Total after two or more discountsChange in salaryProfit or LossCompound InterestPopulation growth |
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