Refer to figure.
The question provides a lot of information, however it focuses on determining the CG in % MAC for the Zero Fuel Mass (ZFM), making all other information irrelevant.

With a ZFM of 49 000 kg and a Zero Fuel Index of 70.0, we can plot these two lines in the chart. By identifying their intersection point and reading the corresponding CG % MAC against the fan lines, we find that the CG % MAC is approximately 24.3.