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Bank X pays a simple interest of Taka 80 on a principal of Taka 1,000 annually. Bank Y pays a simple interest of Taka 140 on a principal of Taka 1,000 annually, What is the ratio of the interest rates of Bank Y?

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