# Thread: percent increase and decrease

1. ## percent increase and decrease

Help, I am not sure how to find the percent of increase in a problem or even the percent of decrease. My parents have no idea either!!!

Examples: The sales of HiTop sneakers rose from $4billion to$4.4 billion. What is the percent of increase?

One week, a certain stock market index went down from 1,863 to 1,677. What was the percent of decrease?

Find the percent of chan $20,200 to$17,350.

2. Originally Posted by cckrr4025
Help, I am not sure how to find the percent of increase in a problem or even the percent of decrease. My parents have no idea either!!!

Examples: The sales of HiTop sneakers rose from $4billion to$4.4 billion. What is the percent of increase?

One week, a certain stock market index went down from 1,863 to 1,677. What was the percent of decrease?

Find the percent of chan $20,200 to$17,350.
$\text{percentage change} = \frac{\text{New} -\text{Original}}{\text{Original}} \times 100$

0.1%
-0.099%
-0.141%

3. Originally Posted by cckrr4025
Help, I am not sure how to find the percent of increase in a problem or even the percent of decrease. My parents have no idea either!!!

Examples: The sales of HiTop sneakers rose from $4billion to$4.4 billion. What is the percent of increase?
first you need to know how much it increased

$$4.4$B $-$$ $4$B = $$0.4$B it increased by$0.4 B

B(original price)=$4 B P(amount increased)=$0.4 B
R(percent increased)=?

$R=\frac{0.4}{4}$ in billions

R=1%
you can check it by $B=\frac{P}{R}$

One week, a certain stock market index went down from 1,863 to 1,677. What was the percent of decrease?

Find the percent of chan $20,200 to$17,350.
find first how much it decreased then use the formula