WBCS Mains 2019 Official Paper-VI

A retailer getting a discount of $20\%$ on the marked price sells an article at the marked price. The percentage of profit of the retailer is:

A fruit seller purchased bananas at $\text{Rs. }30$ per dozen and sold each pair at $\text{Rs. }7$. What is the percentage profit or loss at this?

Selling a radio at $\text{Rs. }363.75$, there was a loss of $3\%$ to a radio seller. At what price should he sell the radio to make a profit of $10\%$?

A businessman purchased $35\text{kg}$ of pulse at $\text{Rs. }525$ and sold each kg at the rate of $\text{Rs. }18$. What is his percentage of profit or loss at this?

A hawker purchases some mangoes at the rate of $9$ mangoes for $\text{Rs. }5$ and sells them at $\text{Rs. }8$ per dozen. What will be his profit or loss percentage?