A project to build a toll road will take **3** years to complete, costing three payments of $**50** million, paid at the start of each year (at times 0, 1, and 2).

After completion, the toll road will yield a constant $**10** million at the end of each year forever with no costs. So the first payment will be at t=**4**.

The required return of the project is 10% pa given as an effective nominal rate. All cash flows are nominal.

What is the **payback period**?