Relationship between resistivity and Mathiessen's Rule

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Lindoc
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This question has bogged me down for hours. Please help.

An alloy of metals is found to have a resistivity of 1.2e-6Ωm at 300K. When it is heated to a temperature of 973K, the resistivity is found to increase by 10 per cent. Assuming Mathiessen's rule to hold good for the alloy, find its resistivity due to inpurities scattering alone.
 
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Welcome to PF!

Hi Lindoc! Welcome to PF! :wink:

Show us what you've tried, and where you're stuck, and then we'll know how to help! :smile:

(Also, state Mathiessen's rule so we don't have to look it up! :redface:)