Answer: Birr 1200
Step-by-step explanation:
Let's assume that the amount he saved in the first year is x birr.
In the second year, he saved x + 100 birr.
In the third year, he saved (x + 100) + 100 birr = x + 200 birr.
Following this pattern, in the fourth year, he saved x + 200 + 100 birr = x + 300 birr.
And so on.
Therefore, in the tenth year, he saved x + 900 birr.
The total amount saved after ten years is given as Birr 16500.
So, x + (x + 100) + (x + 200) + ... + (x + 900) = 16500.
This can be simplified as 10x + 4500 = 16500.
Now, we can solve this equation to find the value of x, the amount saved in the first year.
10x = 16500 - 4500 = 12000.
Dividing both sides by 10, x = 1200.
Therefore, he saved Birr 1200 in the first year.
