How to Find Percentage of a Number

$5\%=0.05$. Multiply $200\times 0.05=10$.

Start with $10\%$ of 160, which is 16. $20\%$ is 2 times $10\%$, so $16\times 2=32$.

$75\%$ is the same as $\frac{3}{4}$. Start by dividing 160 by 4 to get 40, then multiply by 3. $40\times 3=120$.

$30\%$ is the same as 0.3. Multiply $180\times 0.3=54$.

First find $1\%$ of $1800=18$. Then multiply by 12: $18\times 12=216$.

First find $1\%$ of 1200, which is 12. Then multiply by 15: $12\times 15=180$. Subtract the discount: $1200-180=1020$.