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Basic Formula of Percentage -interview

Basic Question

              1.What is the formula for calculating percentage?

Solution: 
               What is the formula for calculating percentage ?

               Formula: 
                              Percentage = (Part / Whole) x 100

               Example: If a student scores 40 marks out of 50, the percentage is:

                               (40/ 50) x 100 = 80%

             2. How do you find the percentage of a given number?

Solution: 
               Multiply the given number by the percentage and divide by 100.

               Example: Find 25% of 200.

                               (25 / 100) x 200 = 50

             3. If a student's marks increased from 40 to 60, what is the percentage increase?

Solution: 
               Formula:
                                      Percentage Increase = (New Value - Old Value / Old Value) x 100

                               New Value = 60
                               Old Value = 40
                            
                                                             (60 - 40 / 40) x 100 = 50%

             4. A product's price drops from ₹1,200 to ₹900. What is the percentage decrease?

Solution:
               Formula:
                               Percentage Decrease = (Old Value -  New Value / Old Value) x 100

                             New Value = 
                             Old Value = 
       
                              (1200 - 900 / 1200) x 100 = 25%

               5.If 20% of a number is 50, what is the number?

Solution:
               Let the number be A, then:

                                           (20 / 100) x A = 50

                                          A = (50 x 100) / 20 = 250


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