30% of marked price is equal to 50% of cost price. If no discount if given, then what will be the profit percentage?

66.67%

Given, 30% marked price = 50% cost price

Marked Price = $\frac{5}{3}$ Cost price 

If no discount is given, marked price = selling price 

Profit = Selling price - Cost price

         =  $\frac{5}{3}$ Cost price  -  Cost price

         =  $\frac{2}{3}$ Cost price 

Profit % =  $\frac{2}{3}$ x 100 = 66.67%