Well draw a box with 10 squares going up and 20 square is going sideways and then shade and 5/8 of it
0 it is at ocean level so elevation is zero
RM298
reason: multiply RM4 by 10 to get RM40 and add that to RM258 to get RM298
First Divide: 21.75/ 30
You will get 0.725
Then, multiply 0.725 by 100%
Then your answer should be: 72.5%