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1. I sold two watches for Rs. 300 each, one at loss of 20% and other at the profit of 20%. What is the percentage of loss (-) or profit (+) that resulted from the transaction?

Solution:
In such cases, always loss occurs. It can be calculated by this formula,
=(loss or gain percentage)2100=4
That is 4% of loss

Graphic Change method
100 == 20%(loss) ⇒ 120 == 20%(gain) ⇒ 96
% Loss = 4%

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