`0.9775+999.98+98.750-9999.099=?`

Options

A. -8899.39
B. 9877.92
C. 8999.93
D. 8899.39

Explanation

To solve the expression \(0.9775 + 999.98 + 98.750 - 9999.099\), we will follow these steps:

### Step 1: Add the first three numbers
First, we add \(0.9775\), \(999.98\), and \(98.750\).

\[ 0.9775 + 999.98 + 98.750 = 0.9775 + 999.98 = 1000.9575 \]
Now, we add \(1000.9575\) and \(98.750\):

\[ 1000.9575 + 98.750 = 1099.7075 \]

### Step 2: Subtract the last number
Next, we subtract \(9999.099\) from \(1099.7075\):

\[ 1099.7075 - 9999.099 = -9899.3915 \]

### Final Answer
Thus, the final result of the expression \(0.9775 + 999.98 + 98.750 - 9999.099\) is:

\[ \boxed{-9899.3915} \]