strikethree

For example-- if following was earnings series for 5 years:
$100, $150, $175, $180, $200

and CPI for same years was:
5, 10, 12, 15, 20

Real earnings(t):

$100*5/10,
$150*5/12,
$175*5/15,
$180*5/20,
$200*5/??