What will be the net discount (in percent) after giving three successive discounts of 10%, 20% and 30%?

Let marked price = Rs. 100

Selling price after first discount of 10% = $$100-(\frac{10}{100}\times100)$$

= $$100-10=Rs.$$ $$90$$

Similarly, selling price after second discount of 20% = $$90-(\frac{20}{100}\times90)$$

= $$90-18=Rs.$$ $$72$$

And selling price after third discount of 30% = $$72-(\frac{30}{100}\times72)$$

= $$72-21.6=Rs.$$ $$50.4$$

$$\therefore$$ Net discount = $$\frac{(100-50.4)}{100}\times100=49.6\%$$

=> Ans - (B)