throughput accounting

A manufacturing company uses machine C, which is operational for five hours a day to manufacture four products: W, X, Y and Z. Factory costs are $150,000 per day.

The company uses throughput accounting and its objective is to maximize profits.

Information relating to these products is as follows:
Products——————————–W——–X——–Y——–Z
Production rate/machine hrs—–200——500—-400—–350
Selling price per unit ($)———–350——190—-270—–215
Material cost per unit ($)———-120——-95—–160——75
Conversion cost per unit ($)——-40——-25——20——-35

If the company is not able to increase the availability of machine C’s
operational hours, what is the production ranking of product Y?

A. First
B. Second
C. Third
D. Forth

[My answer]
The company uses machine C which is operational for 5 hours a day to make four products W, X, Y, Z. So every product is taking 5 hours to produce the products.

Products———————————–W———X———-Y———-X
Production units————————200——-500——400——-350
Total Throughput cost ($)———-46000—-47500—44000—-49000
Total Machine hours—————–1000——2500—–2000—–1750
Throughput cost / machine hours–46———19——–22———28
Ranking———————————-1st———4th——-3rd——–2nd

According to my answer product Y should be made 3rd in ranking but the correct answer is D (4th).

Please explain why my answer is not correct???