Calculating Payback: An investment project provides cash inflows of $835 per year for 8 years. What is the project payback period if the initial cost is $1,900? What if the initial cost is $3,600? What if it is $7,400?

ANSWERS: these are the answers to the question. I need to know how to get these answers. Please show all work on excel.

12% NPV	$1,281,635.50
15% NPV	$988,117.90
20% NPV	$573,107.00