`8.5xx(80xx1.5xx2.5)div4=?`

Options

A. 637.5
B. 620.5
C. 544.22
D. 647.5

Explanation

To solve the expression \( \frac{8.5 \times 80 \times 1.5 \times 2.5}{4} \), we can follow these steps:

### Step 1: Multiply the constants
First, we can simplify the multiplication of the constants before dividing by 4.

\[ 8.5 \times 80 \times 1.5 \times 2.5 \]

### Step 2: Calculate \( 80 \times 1.5 \)
Let's first calculate \( 80 \times 1.5 \):

\[ 80 \times 1.5 = 120 \]

### Step 3: Multiply the result by \( 2.5 \)
Now we will multiply \( 120 \) by \( 2.5 \):

\[ 120 \times 2.5 = 300 \]

### Step 4: Multiply by \( 8.5 \)
Now, we will multiply \( 8.5 \) by \( 300 \):

\[ 8.5 \times 300 = 2550 \]

### Step 5: Divide by \( 4 \)
Finally, we will divide \( 2550 \) by \( 4 \):

\[ \frac{2550}{4} = 637.5 \]

### Final Answer
Thus, the final answer is:

\[ \frac{8.5 \times 80 \times 1.5 \times 2.5}{4} = 637.5 \]