Answer:
210 hours
Step-by-step explanation:
The learning curve rate can be found by log75%
Ln0.75 = 0.12249
1 batch requires 200 hours
The 1500 units batch will require 200 hours
For 3000 units there will be two batches of 1500 units each
200 hours * 2 batches * 0.12249 * 4.5 = 210 hours