Let her money in the beginning be ₹ x.
According to question,
x-75% of x=600

⇒ x-75/100 X x=600
⇒ x-(3/4)x = 600
⇒ x (1- 3/4) = 600
⇒ x(4-3/4) = 600
⇒ x = 600 x 4 = ₹ 2400
Hence the money in the beginning was ₹ 2,400.

Class 8 Maths Chapter 8 Exercise 8.1 Solution in Video

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https://www.tiwariacademy.com/ncert-solutions/class-8/maths/chapter-8/