What will be 80 percent of a number whose 200 percent is

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What will be 80 percent of a number whose 200 percent is 90 ?

1. 144
2. 72
3. 36
4. None of these

Correct Option: C

∵ 200% of N = 90
⇒ N = (90 x 100) / 200 = 45
∴ 80% of N = (80 x 45) / 100 = 36