Write SQL query to solve given problem: Calculate the percentage of sold blades in the total number of transactions.. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT CAST(SUM(IIF(T1.Name = 'Blade', T2.Quantity, 0)) AS REAL) * 100 / SUM(T2.Quantity) FROM Products AS T1 INNER JOIN Sales AS T2 ON T1.ProductID = T2.ProductID