Two different discounts x% and y% are allowed on two items having same cost price and marked price. If P1% and P2% are respectively the profits on them, x - y = 20 and P2 - P1 = 32, then the ratio of their cost price to their marked price is
1
52 ∶ 12
2
10 ∶ 18
3
5 ∶ 8
4
16 ∶ 5