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y is directly proportional to x2

x is increased by 100%

find the percentage increase in y.

so,

y= k x2

then y= k x2

y=k 4 x2

so 4 x2 is already increased by 100%?

then to find k which is

y=k 4 x2

k= y/ 4 x2

find the percentage increase in y,

so what i did was :

y= y/4 x2 *100 x2

can somebody helpp to correct it??

thanks lotsa.