Temperature Correction
Guys,
Ignore the altimeter setting, it is the local setting and not introducing any errors.
When making temperature corrections, you need to correct the height [B]of the column of air[B]. In this case the elevation is 2500' and you are at 10,000' so the column is 7500' tall(ISA). Using Cathay's 10% correction for the actual ISA-15, that means that the true height of the column is 10% less = 6750'. Adding the elevation back on means that your true altitude is 9250'.