Correct Answer - Option 4 : 1 : 2

**Given: **

A flower vase seller gives a discount of 30% and still earns a profit of 40%.

**Formula used: **

Cost price : Marked price = CP : MP = (100 – discount%) : (100 + profit%)

**Calculation:**

According to the question, discount% = 30% and profit% = 40%

⇒ CP : MP = (100 – discount%) : (100 + profit%) = (100 – 30%) : (100 + 40%) = 70 : 140 = 1 : 2

∴ Ratio of cost price to marked price of the vase = 1 : 2.