Throughput accounting

QUESTION 2
MUSHAMBANZOU Ltd produces three products using three different machines. The following information is available for a product for a period:
Product
Selling price per unit Direct materials Direct labour Overheads
Estimated sale demand (unit)
Machine hours required per unit: Machine 1 Machine 2 Machine 3
X Y ($) ($) 20 15
8 5
5 3 2 1
310 280
4 2 4 3 3 1
Z ($) 10
4 2 1
250
1
2 3
Machine capacity is limited to 2,000 hours for each machine.
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Total assembly labour hours
19,000 23,000

Required:
(a) Calculate throughput accounting ratio and rank the products.

How do I identify a bottleneck here