In a show room, the marked prices of various items are displayed in such a manner that after giving a 10% discount to the customers, the owner of the show room earns a profit of 20%. What is the ratio of the marked price and cost price of each item?
1
3 ∶ 4
2
4 ∶ 3
3
5 ∶ 2
4
2 ∶ 5