Neelu buys lemons at the rate of 2 lemons in one rupee and sells them at the rate of 5 lemons in three rupees. Her profit is

Explanation

Cost price of 2 lemons (cp) = ₹1 Selling price of 5 lemons (sp) = ₹3 Now $2cp = ₹1 \quad \dots(i)$ $5sp = ₹3 \quad \dots(ii)$ multiply by 3 to the (i) equation- $6cp = ₹3 \quad \dots(iii)$ using equation (iii) and (ii)- $6 cp = 5 sp$ $$ \frac{sp}{cp} = \frac{6}{5} $$ $$ P\% = \frac{sp - cp}{cp} \times 100\% $$ $$ P\% = \frac{6 - 5}{5} \times 100\% $$ $$ P\% = 20\% $$