Answer: The required dealers cost of the refrigerator is $417.
Step-by-step explanation: Given that the selling price of a refrigerator is $521.25 and the markup is 25% of the dealers cost.
We are to find the dealers cost of the refrigerator.
Let x denotes the dealers cost of the refrigerator.
Then, according to the given information, we have
![x+25\%* x=521.25\\\\\Rightarrow x+(25)/(100)* x=521.25\\\\\\\Rightarrow x+(1)/(4)x=521.25\\\\\\\Rightarrow (5x)/(4)=521.25\\\\\\\Rightarrow x=(521.25*4)/(5)\\\\\\\Rightarrow x=(2085)/(5)\\\\\Rightarrow x=417.](https://img.qammunity.org/2020/formulas/mathematics/middle-school/4ays7ve8od6l8bmhp5ip4m4rjgbpppxcnp.png)
Thus, the required dealers cost of the refrigerator is $417.