Answer:
price divisor after split is 4.5
Step-by-step explanation:
given data
stock prices = $10
stock prices = $20
stock prices = $80
stock prices = $50
stock prices = $40
solution
we find here first price weighted index for all 5 stock that is
price weighted index =

price weighted index = $40
so
price weighted index before split is $40
so after split last stock became half
so new price divisor
we consider denominator to be x
so
40 =

x =

x = 4.5
so price divisor after split is 4.5