1. A herd of 100 caribou was moved to a new location. The population increased by 10% the first year and then increased by 20% the second year.
A. Find the population after the second year.
FIRST YEAR
First find the 10% of 100.
100 divided by 10= 10
the 10% of 100 is 10
then add 10 to 100.
100+10=110
SECOND YEAR
Find the 20% of 110.
110 divided by 10=11
then multiply it by 2
11 x 2= 22
the 20% of 110 is 22
then add 22 to 110
110+22= 132
The population after two years is 132 caribou.
B. Explain why there was not a 30% increase in population over two years.
The increase is not 30% because the 20% increase in the second year is based on the new population after 10% increase in the first year.
2. Chris purchased the following items:
- 2 binders at $4.99 each
- 1 math set for $3.99
- a backpack for $19.99
Find the total cost including 5% GST and 7% PST.
2 binders 4.99 x 2= 9.98
$9.99
9.99 + 3.99 + 19.99 = 33.97
$34
34 x 1.12 = 38.08
$38.99
The total cost including the 12% of taxes is $38.99
3. A store discounted items by 50% off the original price one week. The following week an additional 10% was taken off the already reduced price. The regular price of a CD player was $85.00. What is the reduced price in the second week.
CD $85.00
1st week 50% off
85 divided by 2 equals $42.50
2nd week 10% of the already reduced price
42.50 divided by 10 equals $4.25
42.50 - 4.25 = $38.25
The reduced price in the second week is $4.25
1. R C E E T N P
Percents means out of 100.
2. C R A T F I O L N A
A Fractional percent is a percent that includes a portion of 1%.
3. M C N O B D E I
Percents that are added together are combined percents.