X-0.009x200=6.38
X- 1.8=6.38
X=6.38+ 1.8
X=8. 18
A: At present, the highest altitude in Maldives is 8.18m.
0.009m x200 years later = submerged height.
Submerged height+the highest altitude after 200 years = the highest altitude in Maldives at present.