The number of students in a coaching centre grew by 20% in one year and by a further 25% in the next. If it now has 2700 students, how many did it have before the two increases?

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Accepted Answer

1800. The two rises multiply: 1.20 × 1.25 = 1.50, so the original number = 2700/1.50 = 1800. (Undoing only the second rise gives 2700/1.25 = 2160 and undoing only the first gives 2700/1.20 = 2250.)

The number of students in a coaching centre grew by 20% in one year and by a further 25% in the next. If it now has 2700 students, how many did it have before the two increases?

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