

Given, thickness of each sheet = 0.0015
So, thickness of 90 sheets = 90 * 0.0015 = 0.135
Again, thickness of each paper = 0.00015
So, thickness of 120 papers = 120 * 0.00015 = 0.018
Now, total thickness of stack = thickness of 90 sheets + thickness of 120 papers
= 0.135 + 0.018
= 0.153 dam
