ExplanationFor problems that ask for percents and use no real numbers, it is almost always possible to use 100 as a starting number.
Suppose the retailer buys each toy for $100, and thus sells it for a regular price of $125.
A reduction of this regular selling price by 80% drops the price to $25. The loss on each toy sold as a percent of the retailer’s cost is:
\(\frac{100-25}{100 \times 100}=75%\)
Hence option D is correct!
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