Question

3. A fruit seller bought some oranges at the rate of Rs.20/- for 5 and sold them at
the rate of Rs.20/- for 4. His profit per cent is:​

Answer 1

Step-by-step explanation:

Let the no. of oranges =x= no. of bananas 

cost price =5x+2x=7x

Gain on oranges =10020×5x=x

Gain on Bananas =10015×2x=0.3x

Profit ⇒1.3x=390

⇒x=1.3390=300

No. of oranges purchased =300.