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Question is:-

A Shopkeeper sold 20 articles for Rs.80and gained 20%.How many articles did she buy for Rs.80.​

Answer 1

Explanation:

20% of Rs.80 = Rs.16

hence , original price of 20 articles

= 80 - 16

= Rs. 64

Now,

20 articles for Rs. 64

so, 1 article for Rs. 3.2

Now,

For Rs. 3.2 - 1 article

For Rs.1- 1/3.2 articles

For Rs. 80- 1/3.2*80 articles

= 25 articles

Hope it helps you

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Answer 2

$\sf \red {\underline {\underline{Given :-}}}$

ᴀ sʜᴏᴘᴋᴇᴇᴘᴇʀ sᴏʟᴅ 20 ᴀʀᴛɪᴄʟᴇs ғᴏʀ ʀs.80ᴀɴᴅ ɢᴀɪɴᴇᴅ 20%.ʜᴏᴡ ᴍᴀɴʏ ᴀʀᴛɪᴄʟᴇs ᴅɪᴅ sʜᴇ ʙᴜʏ ғᴏʀ ʀs.80.

$\sf \red{ \underline{ \underline{To \: Find :-}}}$

ʜᴏᴡ ᴍᴀɴʏ ᴀʀᴛɪᴄʟᴇs ᴅɪᴅ sʜᴇ ʙᴜʏ ғᴏʀ ʀs.80 .

$\sf \red { \underline{ \underline{Solution :-}}}$

ʟᴇᴛ ᴄᴏsᴛ ᴘʀɪᴄᴇ = ᴄ.ᴘ

s.ᴘ ᴏғ ʀs.80 = ᴄ.ᴘ ғᴏʀ 20 + ɢᴀɪɴ

ɢᴀɪɴ = 20%

ɢᴀɪɴ = s.ᴘ × (20 × 100)= 0.2 s.ᴘ

s.ᴘ = s.ᴘ + 0.25 s.ᴘ = 1.2 s.ᴘ

s.ᴘ = 50

20 ᴀʀᴛɪᴄʟᴇs = ʀs.50

sᴏ, ʜᴇ ᴡɪʟʟ ɢᴇᴛ 60

$\bf \blue{\fbox{= 24\: is\: the \:Answer}}$