Question:If` z = x^2/y` and x , y both are increased in value by 10% then the value of z is : 

A unchanged 
B increased by 10% 
C increased by 11% 
D increased by 20% 

+ Answer
B 

+ Explanation
`z = x^2/y`

New value of ` z =(((110)/(100) x)^2)/(((110)/(100)  y))`

           `= (11  x^2)/(100)  y`

          `= (11)/(10)  z`

:. Increase % `= (((11)/(10)  z - z))/(z) xx 10`

    `= 10%`

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Irin Moni

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