What approximate value should come in place of the question mark (?) in the following equation?
(Note: You are not expected to calculate the exact value)
`71% "of" 259-6321=?-5% "of" 910`

Options

A. 50
B. 164
C. 310
D. 288

Explanation

To solve the equation \( 71\% \text{ of } 259 - 632.1 = ? - 5\% \text{ of } 910 \) and find the approximate value of \( ? \), we can follow these steps:

### Step 1: Approximate the percentages and numbers
We start by approximating the percentages and numbers involved:
- Approximate \( 71\% \) as \( 70\% \).
- Approximate \( 259 \) as \( 260 \).
- Approximate \( 632.1 \) as \( 630 \).
- Approximate \( 910 \) as \( 900 \).

### Step 2: Calculate \( 70\% \) of \( 260 \)
Now, we calculate \( 70\% \) of \( 260 \):
\[ 70\% \text{ of } 260 = \frac{70}{100} \times 260 = 0.7 \times 260 = 182 \]

### Step 3: Calculate \( 5\% \) of \( 900 \)
Next, we calculate \( 5\% \) of \( 900 \):
\[ 5\% \text{ of } 900 = \frac{5}{100} \times 900 = 0.05 \times 900 = 45 \]

### Step 4: Substitute the values into the equation
Now we substitute the calculated values back into the equation:
\[ 182 - 630 = ? - 45 \]

### Step 5: Simplify the equation
Now we simplify the left side:
\[ 182 - 630 = -448 \]
So, we have:
\[ -448 = ? - 45 \]

### Step 6: Solve for \( ? \)
To find \( ? \), we add \( 45 \) to both sides:
\[ ? = -448 + 45 = -403 \]

### Step 7: Final approximation
Since we are looking for an approximate value, we can round \( -403 \) to the nearest whole number, which is \( -403 \).

### Conclusion
Thus, the approximate value that should come in place of the question mark (?) is:
\[ \boxed{-403} \]