$\"\"$

The part is 10 and the whole is 50. You need to find the percent.

Let n represent the percent.

Part = percent $\"\"$ whole

10 = n $\"\"$ 50 (Substitute part = 10 and whole = 50) $\"\"$

$\"\"$ (Divide each side by 50)

$\"\"$ (Cancel common terms)

$\"\"$ (Divide: $\"\"$ )

$\"\"$ (Multiply with 100 and add percent sign)

$\"\"$ (Multiply: $\"\"$ ) $\"\"$

10 is 20 $\"\"$ of 50.