Subscribe:

## Monday, December 12, 2011

### Ashley's Textbook Questions.

3)Q. Kyle says that a population increase of 15% one year followed by an increase of 10% the next year is the same population increase of 25% over two years. Is Kyle correct? Explain.

3)A. Kyle is wrong because if you add 10+15% you get 115 and if you add 10% to that you get 126. This doesn't add up to 25%.

7)Q. A herd of 100 caribou was moved to a new location. The population increased by 10% the fist year and then increased by 20% the second year. Find the population after the second year. Explain why there was not 30% increase in population over two years.

7)A. 100+10% (First Year) =110
110+20% (second Year) =132
B. Because it wasn't 30% for 2 years. It was 2 different numbers for 2 different years.

9)Q. Arjay was thinking of buying a car worth \$23 000, but delayed purchasing the car for a year. During that year, the cost of the car increased by 3.2%. What was the price of the car when Arjay purchased it? What was the total cost of the car including 5% GST and 5% PST?

9)A. \$23 000+3.2% = \$23 736 (CAR PRICE)

CAR \$23.736 5% GST= 1 186.80 7% PST=\$1 661.52

TOTAL TAX= \$ 2 848.32
TOTAL PRICE=\$ 26 584.32