Suma mnożenia kolumn dla wierszy o podobnych identyfikatorach w MySQL

SELECT
id, 
SUM(amount*price) AS total
FROM mytable
GROUP BY id

Dane:

| id | amount | price |
|----|--------|-------|
| 2  | 3      | 19    |
| 2  | 3      | 89    |
| 3  | 203    | 1     |

Wynik:

id  total
2   324
3   203