Vc = Value to be compared
Vb = Value to which it has to be compared, base value.
What is the percentage of marks scored by Sai in final exam, if she has scored 1102 out of 1200?
Vc = 1102
Vb = 1200
Percentage = (1102/1200) x 100
Percentage increase or decrease
F.V = Final value; I.V = Initial value
If final value is less than initial value, it is % decrease
If final value is more than initial value, it is % increase.
Sradha’s monthly salary is Rs. 40000. If an increment of Rs. 5000 is provided, what is the percentage increase in her salary?
F.V = 45000; I.V = 40000.
Substituting the values in the above formula, we get
% increase = [(45000 – 40000)/40000] x 100
= (5000/40000)x 100
= 12.5 % increase
Net change in percentage after two individual percentage changes
a = first percentage change
b = second percentage change
Substitute ‘-‘ in case of percentage decrease
Salary of Sai was Rs. 20000. If the salary is decreased by 10 percent and then increased by 30 percent, what is the new salary of Sai?
a = -10
b = 30
Net change = -10 + 30 + [(-10)(30)/100]
= 20 – 3 = +17% (positive value = % increase)
New salary of Sai = 20000 + (17/100)20000