Answer:
A. Because it earns interest.
In a bank you can earn interest and the money saved will constantly be increasing. Hope this helps!
Answer:
There is 10% error in both minimum and extreme values i.e. 120 & 140 , Error in 120 is 10% i.e. = 12, Since value can be more or less in error ∴ Error in 120 is ±12.
