What is the payback period?

Or how long will it take for thr prohect to

generate enough cash to pay for itself?

Initial investment $(cost)=1000$

benefits$(cash$ flows$)$

$yr1=100$

$yr.2=200$

$yr3=100$

$yr4=300$

$yr5=50$

$yr6=50$

$yr7=250$

$yr8=200$

$yr9=200$

$yr10=100$