Discussion

Explanation:

If x be the number of oranges at each of the prices, then,

Total purchase = x/11 + x/9 = (9x + 11x)/99 = 20x/99

Sales revenue = 2x/10 = x/5

% gain = $\frac{{\displaystyle \frac{x}{5}}-{\displaystyle \frac{20x}{99}}}{{\displaystyle \frac{20x}{99}}}\times 100$ = $\frac{{\displaystyle \frac{99x-100x}{495}}}{{\displaystyle \frac{20x}{99}}}\times 100$ = $\frac{-x}{495}\times \frac{99}{20x}\times 100$ = -1 or 1% loss.

Hence, option (c).

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