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Dr Penny Pincher says
A. z=2x
Equation 1: (x/100)y=100
Equation 2: (y/100)z=200
Solve equation 1 for y, substitute y=10000/x into equ 2

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Sakhi Deshmukh says
Answer is A:z=2x
x/100 * y = 100
x=10000/y..............(1)
y/100 * z =200
y=20000/z
Put the value of y into equation (1)
x=10000/20000*z
z=2x

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