I tried to solve this question and got the answer to be 79.8 m.

The correct answer is apparrantly 204 m.

I hope you can help me solve this question.

The question:

From point A, the angle of elevation to the top a tall building is 20 degrees. On walking 80 m towards the building the angle of elevation is now 23 degrees. How tall is the building?

Thanks,

Amine