Provide a neatly drawn mechanism for the following reaction, including curved arrows to show the movement of paris of electrons and the structure of reactive intermediates. 
The reaction proceeds in two steps:
1. Addition of bromine to propene to afford a cyclic bromonium ion
2. Nucleophilic ring-opening addition of bromide anion
Definitions:
Variable Costs
Financial outlays that shift proportional to the volume of production or sales, encompassing labor and material costs.
Contribution Margin
The difference between the sales revenue generated from a product or service and its variable costs.
Pretax Income
The income of a company before taxes are deducted, used to assess profitability before tax expenses are applied.
Margin of Safety
The difference between actual sales and break-even sales, measuring the risk of not reaching the break-even point.
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