To solve this problem you must apply the proccedure shown below:
1. She has a total of 50 DVDs of 90 minutes each one of them. The cost of each DVD was 11€.
2. Therefore, to calculate the total cost of the collection, you must multiply the cost of each DVD by the total number of them:
[tex]total=(11)(50)=550[/tex]€
3. To calculate the total minutes of the collection, you must multiply 90 minutes by the total number of DVDs:
[tex](90min)(50)=4500min[/tex]
Therefore, the answer is: 550€ and 4500 minutes.