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Bank X pays a simple interest of Taka of 80 of Taka 1000 annually. Bank Y pays a simple interest of Taka 140 on a principal of Taka 1000 annually. What is the ratio of the interest rates of Bank X to Bank Y?

1. A 2 : 4
2. B 4 : 7
3. C 6:8
4. D 9 : 18