Find the cost of each type of meat separately, then add.<br><br>
&bull; Cost of fish: 20 × $12.50 = $250<br>
&bull; Cost of mutton: 30 × $8.75 = $262.50<br>
&bull; Total cost: $250 + $262.50 = $512.50<br>
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Final Answer: $512.50