Question
If $P_{01}(L) = 40$ and $P_{01}(P) = 90$, find $P_{01}(D-B)$ and $P_{01}(F).$

Answer

Given, $P_{01}(L)=40$ and $P_{01}(P)=90$
Dorbish-Bowley's Price Index Number
$ P_{01}(D-B)=\frac{P_{01}(L)+P_{01}(P)}{2}$
$=\frac{40+90}{2}$
$=\frac{130}{2}$
$=65 $
Fisher's Price Index Number
$ P_{01}(F)=\sqrt{P_{01}(L) \times P_{01}(P)}$
$=\sqrt{40 \times 90}$
$=\sqrt{3600} $
$= 60$

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