Please, I need help with this exercise asap. I need to find the most cost-efficient solution for the problem. Please explain step by step if possible. Thank you!

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Identify the critical path(s). Trim 3 days from the project duration. Which activities should be shortened so that the cost is the lowest? What is the additional cost? Identify the critical path(s). Trim 3 days from the project duration. Which activities should be shortened so that the cost is the lowest? What is the additional cost