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Calculation Type Calculation Formula
Calculation Method
and Key Operations
Ratio
Example 2
A
B
× 100
What percent of B is
A?
A B (%)
Premium
Example 3
A +
A × B
100
What is A increased by
B percent?
A B (%)
Discount
Example 4
Example 5
A -
A × B
100
What is A decreased
by B percent?
A B (%)
Rate of Change (1)
Example 6
A + B
B
× 100
If A is added to B, by
what percent does B
change?
A B (%)
Rate of Change (2)
Example 7
A - B
B
× 100
If B becomes A, by
what percent does B
change?
A B (%)
Example 1: To calculate 12% of 1500 (180)
1500 12 (%) 180.
Example 2: To calculate what percentage of 880 is 660 (75%)
660 880 (%) 75.
Example 3: To increase 2500 by 15% (2875)
2500 15 (%) 2875.
Example 4: To decrease 3500 by 25% (2625)
3500 25 (%) 2625.
Example 5: To decrease the sum of 168, 98, and 734 by 20% (800)
168 98 734 (STO) (A)
(A)* 20 (%) 800.
18
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