Question

this isint really a question but i would like to study because i have a test in a few days can someone help me practice please in learing percent increase and decrease.

Answer 1

To calculate the percentage increase, we can follow the general rule:

$\begin{gathered} \text{Increase=New Number - Original Number} \\ \text{then} \\ \text{ \%increase = Increase /(Original number }\cdot\text{ 100)} \end{gathered}$

Notice that if the answer is a negative number, then this is a percentage decrease.

For example, if you work 35 hours one week and another you work 45.5, to find the percentage increase we do the following:

$\begin{gathered} \text{Increase = New Number - Original Number} \\ \Rightarrow Increase=45.5-35=10.5 \end{gathered}$

then:

$\frac{10.5}{35\cdot100}=\frac{1050}{35}=30$

therefore, the percentage increase is 30%