90 is 36% of 250.
Step 1: Translate the words into an equation.
90 | is | what percent | of | 250 |
90 | = | x | $ \cdot $ | 250 |
Step 2: Solve for $ x $.
$$ \begin{aligned} 90 &= x \cdot 250 \\[1.2 em] 250 \cdot x &= 90 \\[1.2 em] x &= \dfrac{ 90 }{ 250 } \\[1.2 em] x &= 0.36 \end{aligned} $$Step 3: Express $ x $ as a percentage.
$$ x = 0.36 = 0.36 ~~\cdot~~ 100 \% = 36 \% $$