$$(255-55) \% 4 \times 5-504 \% 3$$
$\frac{622}{25}=24.88$
$$\frac{200}{100}\times 4\times 5-\frac{504}{100}\times 3$$
$$2\times 4\times 5-\frac{504}{100}\times 3$$
$$8\times 5-\frac{504}{100}\times 3$$
$$40-\frac{504}{100}\times 3$$
$$40-\frac{126}{25}\times 3$$
$$40-\frac{126\times 3}{25}$$
$$40-\frac{378}{25}$$
$$\frac{1000}{25}-\frac{378}{25}$$
$$\frac{1000-378}{25}$$
$$\frac{622}{25}$$
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$\frac{2 \cdot 311}{5 ^ {2}} = 24\frac{22}{25} = 24.88$
