Question

Can i please get help with this question. I have attached my answers but whould like to know it they are correct.
Assume that an integer requires 2 bytes of space and a reference requires 4 bytes of space. Also assume the maximum queue size is 200.
How much overhead space (in bytes) is needed, assuming a queue that holds ints, for:
The text's bounded array-based queue holding 20 elements? 
My Answer 840
The text's bounded array-based queue holding 100 elements?
 My Answer 1000
The text's bounded array-based queue holding 200 elements? 
My Answer 1200
The text's reference-based queue holding 20 elements? 
My Answer 80
The text's reference-based queue holding 100 elements? 
My Answer 400
The text's reference-based queue holding 200 elements? 
My Answer 800

For what size queue do the array-based and reference-based approaches use approximately the same amount of overhead space? 
My answer Queue of 200 elements

Thanks you so much.