Question

A number increased by 20% and then it is decreased by 10% find the net increase or decrease percent

Answer 1

Answer:

8 percent

Step-by-step explanation:

NOTE - in such type of question to save your valuable time you can use below given formula.

Net effect percent = X + Y+ XY / 100

always use positive signed for increase negative sign for decrease

Required answer

= 20- 10- 20×10/100

= 10-2

= 8 percent.

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Answer 2

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Let the no. be Rs.100

• 20% Increased

100 + ( 100 x 20/100)

100 + 20

⇢Rs.120

Then,

• 10% decreased

120 - ( 120 x 10/100)

⇢120 - 12 = 108

⇢Now, 108 - 100 = 8

•So, net increase or decrease percent

⇢8/100 x 100 = 8%