self Maths Puzzle Numerical Ability Profit and Loss

a shopkeeper sells two items at the same price. If he sells one of them at a profit of 10% and the other at a loss of 10%, find the percentage profit/loss.

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self Other Question

tell two numbers which we subtract then we get square of some number and if we add the square of those numbers we get cube of some number and if we add those numbers and then add the digits of that result we get square of some number. tell the two numbers. .
What is the sum which earned interest?

I.

The total simple interest was Rs. 7000 after 7 years.

II.

The total of sum and simple interest was double of the sum after 5 years.

A. I alone sufficient while II alone not sufficient to answer
B. II alone sufficient while I alone not sufficient to answer
C. Either I or II alone sufficient to answer
D. Both I and II are not sufficient to answer
E. Both I and II are necessary to answer