Correct Answer - Option 4 : 21% profit
Given:
cp = 11 article = Rs. 10
sp = 10 article = Rs. 11
Formula used:
SP = CP × (100+P %)/100
CP = SP × 100/(100 + p %)
Calculations:
Article price
⇒ cp 11 Rs. 10
⇒ sp 10 Rs. 11
We will equate the quantity of article
Article price
⇒ cp 11 × 10 Rs. 10 × 10
⇒ sp 10 × 11 Rs. 11 × 11
⇒ cp = Rs. 100
⇒ sp = Rs. 121
⇒ Profit% = (121 - 100) × 100/100
⇒ Profit% = 21%
∴ The profit% is 21%.