HCL Company Numerical Ability Profit and Loss

If an article is bought at a profit of 15% and sold at a loss of 15% what is my total profit percent or loss percent?

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HCL Other Question

If one type of tobacco costs Re.1/- per kg and other type costs Rs. 5/- per kg. What quantity of first type and second type are mixed so that 100 kg of mixture osts Rs. 100/-? A was born when B was 1 year and 3 months old. C was born when A was 2 years 1 month old. What is the age of B when C is 4 years and 6 months old?