Answer:
See explanation below.
Step-by-step explanation:
Let's say, [tex]x[/tex] represents the sale price of radio.
Then the marked price of the radio is [tex]1.25x[/tex]
The cost price of the radio is [tex](1.25x)(0.70)[/tex]
The discount is simply 25% because the radio is being sold at 25% less then the marked price.
The gain percent is given as:
[tex]\frac{x-1.25x\times \:0.70}{x}\times 100\\\\=12.5\%[/tex]
The radio is being sold at 12.5% gain.
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