$\"\"$

The expression is $\"\"$ .

Round to the nearest whole number then multiply.

21789 rounded to the nearest whole number is 20000.

89 rounded to the nearest whole number is 100. $\"\"$

The expression becomes: $\"\"$

$\"\"$ (Divide: $\"\"$ )

So, $\"\"$ $\"\"$

The product is about $\"\"$ .