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ব্যাখ্যা ও সঠিক সমাধান
উত্তর:
20
Let's consider the salary of an officer to be 100.
So, If the salary is increased by 25%, then the new salary - 100 + [100 × (25/100) ] = 100 + 25 = 125
So, his new salary is 125
To make his salary original 25 must be subtracted from 125, then his salary will be 125 - 25 = 100 or original salary.
So, To find the percentage of salary which must be decreased we must find that 25 is what percentage of 125.
So, decrease%
= (25/125) × 100
= 1/5 × 100
= 20%
Answer) 20% of his new salary must be deducted so that his salary becomes Original.