David Weber, Talei Kunkel, Harriet Simand and, Justin Medved Solutions for Chapter: Percentages Inequality and Difference, Exercise 24: Practice 4

Find the number when given the percentage 

$60\%$ of $55$

Find the number when given the percentage 

$45\%$ of $80$

Find the number when given the percentage 

$90\%$ of $20$

In a store, an item has a new price of $\$63$ after a reduction of $30\%$. If the original price is $\$k$, find the value of $k$.

In Spain, the average annual income of a male is approximately $\in 26000$ and the average annual female income is approximately $\in 20000$. If the approximate percentage of the average male income is the average female income is $k\%$, find the value of $k$.

In Canada, the average annual income of a female aged $25$ to $34$ is $77\%$ of a male in the same age group. If the average annual income of a female is approximately $\$50000$, how much rounded to the nearest thousand dollars, does the average male in the group earns?

In Australia, the average full-time weekly salary for a woman is approximately $84\%$ of the full-time weekly salary for a man. An Australian man earns approximately $\$1600$ per week. If an Australian woman earns $\$k$, find the value of $k$.

During a six-week period in $2012$, the organization Doctors without Borders managed to vaccinate approximately $75\%$ of the population at imminent risk of a disease called cholera in Guinea and Sierra Leone, averting a potential disaster. What was the total population if $170000$ people were vaccinated?