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  1. If x, y, z are three sum of money such that y is the simple interest on x and z is the simple interset on y for the same time and at the same rate of interest, then we have
    1. z² = xy
    2. xyz = 1
    3. x² = yz
    4. y² = zx
Correct Option: D

We know that ,

SI =
Principal × Time × Rate
100

∴ y =
x × T × R
100

and z =
y × T × R
100

So,
y
=
x
⇒ y2 = zx
zy



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