Answer:
30,000
Step-by-step explanation:
50% remaining = 10500
After deposit: 2×10500 = 21000
210000 : 70%
X : 100%
21000/70 = X/100
X = 30,000
We have the next number

The expanded form of the number is

Also, we can verify that Alex was incorrect because if we do the sum of the expanded form that Alex calculated we obtain

Finally, the correct answer is
The answer is C. I don’t think it’s 10 points.