You can use excel but please show all formulas used.

7. You have a manual assembly process which you believe is subject to a learning curve in which assembly time declines by 10% for each doubling of cumulative production. If the first 1,000 widgets took 320 hours to assembly, determine by thousand widget batches how much each batch up to 10,000 widgets produced should take in hours. Include the cumulative total and cumulative average in your table