Question

a number is increased by 40%,then decresed by 40%.find the net increase or decrease percentage.

Answer 1

ʜᴇy ᴍᴀᴛᴇ :

ᴡʜᴇɴ ᴡᴇ ɪɴᴄʀᴇᴀꜱᴇ ᴀ ɴᴜᴍʙᴇʀ ʙy ᴀ % ᴛʜᴇɴ ᴅᴇᴄʀᴇᴀꜱᴇ ʙy ᴀ % ᴛʜᴇɴ ɴᴇᴛ ᴩᴇʀᴇᴄᴇɴᴛᴀɢᴇ(ᴅᴇᴄʀᴇᴀꜱɪɴɢ) ᴡɪʟʟ ʙᴇ :

===> (ᴀ × ᴀ)/100 %

ɴᴏᴡ,

ᴀ = 40%

ᴛʜᴇɴ ᴅᴇᴄʀᴇᴀꜱɪɴɢ ᴩᴇʀᴄᴇɴᴛᴀɢᴇ : (40× 40)/100.

====>>>> 1600/100

====>>>> 16%(ᴅᴇᴄʀᴇᴀꜱɪɴɢ).

ᴩʀᴏᴠᴇ :

ʟᴇᴛ ɴᴜᴍʙᴇʀ ɪꜱ 100.

ᴡʜᴇɴ 100 ɪꜱ ɪɴᴄʀᴇꜱᴇᴅ ʙy 40% ᴛʜᴇɴ :

===>>>> 100 × 40 / 100

======>>>> 40

ᴛʜᴇɴ ɴᴇᴡ ɴᴜᴍʙᴇʀ : 100 + 40 = 140.

ɴᴏᴡ 140 ɪꜱ ᴅᴇᴄʀᴇᴀꜱᴇᴅ ʙy 40% ᴛʜᴇɴ :

====>>> 140 × 40/100

=====>>>> 56

ᴛʜᴇɴ ɴᴇᴛ ᴅᴇᴄʀᴇᴀꜱɪɴ ᴡɪʟʟ ʙᴇ : 140 -56.

======> 84.

ᴛʜᴇɴ ᴛᴏᴛᴀʟ ʟᴏꜱꜱ : 100 - 84 = 16.

ꜱᴏ ᴅᴇᴄʀᴇᴀꜱɪɴɢ ᴩᴇʀᴄᴇɴᴛᴀɢᴇ = 16 × 100/100.

= 16.

ʜᴇʀᴇ ᴡᴇ ᴄᴀɴ ꜱᴇ ʙᴏᴛʜ ᴀɴꜱᴡᴇʀ ɪꜱ ꜱᴀᴍᴇ.


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