Yup. I think you'll find the question will be refering to 30E, not 130E.
Then: 1 / cos(40-30) = 1 / cos10 = 1.015
And then you get the question wrong because it asks for the ERORR. If the original scale was 1.00 (and correct) and your new scale is 1.015, then it has increase by 0.015 (the error). Which, of course, is 1.5%.
Answer (b).
EK