DRDO Multi tasking staff Model paper 1

Let the Cost price of the table be a
Since he gains a profit of 30%, the selling price = a + (30/100) × a = 1.3a
Let the Marked price of the table be b
⇒ b - (35/100) × b = 1.3a
⇒ b = 2a
Now, if he sells the table at 40% discount
New selling price will be = 2a - {(2a) × (40/100)}
⇒ New selling price = 1.2a
∴ New profit percent = [(1.2a - a) /a] × 100 = 20%