A worksheet, created by a company making toothbrushes, contains the
following information within specified cells (given in brackets): Number of
toothbrushes sold (K10), Sale price * number of toothbrushes sold (K11),
Transportation cost per toothbrush * number of toothbrushes sold (K12),
the fixed cost (K13) involved in manufacturing the toothbrushes, and the
net profit (K14). If the company wants to find the number of toothbrushes
they have to sell to make a profit of $5,000, what must they enter in the “By
changing cell” in the Goal Seek Dialog box?