Please calculate the total value of Motorcycles orders.
Motorcycle is a product line; total value = SUM(MULTIPLY(quantityOrdered, priceEach));
SELECT SUM(T1.quantityOrdered * T1.priceEach) FROM orderdetails AS T1 INNER JOIN products AS T2 ON T1.productCode = T2.productCode WHERE T2.productLine = 'Motorcycles'