Hereford Company is planning to introduce a new product with an 80 percent learning rate for production for batches of 1000 unites. The variable labor costs are $30 per unit for the first 1000-unit batch. Each batch requires 100 hours. There are $10,000 in fixed costs not subject to learning. What is the cumulative total time (labor hours) to produce 2,000 units based on the cumulative average-time learning curve?

I know that the answer is 160 hours but I don't understand how to get that answer.