The sum of $8.50 + 12.5$ is:

$8.50 + 12.5 = 21.00$

So, the result is 21.00.

Would you like details or have any questions?

Here are 8 related questions:

1. What is the sum of 7.25 and 15.75?
2. How do you add numbers with different decimal places?
3. Can you add 10.1, 8.25, and 7.6?
4. What is $12.5 - 8.50$?
5. How do you subtract decimals?
6. Can you add $8.50$ three times in a row?
7. What is $8.50 \times 12.5$?
8. How do you multiply numbers with decimals?

Tip: When adding or subtracting decimals, align the decimal points to ensure accuracy.