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A steel scale (calibrated at 25^@C) has ...

A steel scale (calibrated at `25^@C`) has been employed to measure the length of a copper pipe at `25^@C` .However the reading has been taken at `45^@C` .If thermal coefficient of linear expansion of steel and copper are `3times10^(-5)` `per^@C` and `2times10^(-5)` `per ^@C` respectively then percentage error in reading taken is

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