2010018203

SubArea: 
Percent problems
Level: 
B
Project ID: 
2010018203
Accepted: 
0
Clonable: 
0
Easy: 
1
A protective layer of thickness d reduces the level of harmful radiation by 10%. Determine what is the percentage decrease in the original level of harmful radiation after passing through the layer of thickness 3d. Round the result to the whole percent.
73%
70%
30%
27%