To decrease or reduce a Quantity by subtracting Percentage % value (WP-31: Percentage %)

Decrease

120 by 40% 

40% of 120 = `\frac {40}{100}`ｘ120= 48

thus

Decrease of 120 by 40% = 120 - 48 = 72 

Similar Question:

Increase
Rs. 1500 by 12%

Increase
1000 m by 50%

Decrease
700 kg by 18%

The salary of a factory worker is Rs. 5000. He was given an increment of 12%. Find his new salary.

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