A dealer sold two T.V. sets for Rs. 3700 each. on one he

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A dealer sold two T.V. sets for Rs. 3700 each. on one he gained 10% and one other he lost 10%. The dealer's loss or gain per cent is ?

1. 0%
2. 0.1%
3. 1% gain
4. 1% loss

Correct Option: D

Loss% = (Common gain or loss% / 10)²
= (10 / 10)² = 1%