15.34% isthe IRR of a project costing $7,500 that results in annual after-tax cashflows of $2,000 for 6 years. This means:

the NPV of the project is > 0

if the company invests $7,500 in the project today and receives 6 annual cashflows of $2,000, the company's return on its investment would be 15.34% compounded annually.

15.34% of every sales dollar resulted in after-tax profit to the owners

ALL of the above