USD 1: 8 yuan RMB, 1: 8, RMB appreciation 10%, 8:1* (1+10%)->1.

1:8/ 1. 1.

The second problem is this deformation.

Original 1: 8 RMB depreciation10%-> 8:1* (1-10%)->; 8: 0.9, divided by 0.9 on both sides.

1:8/0.9