Question

1. Last year the price of a college textbook(b) was $197. This year the price will be 13% higher. Which expression shows the difference in price from last year to this year? 1. b * 0.13 B. b.1.13 C.b-0.13 D.b - 13

Answer 1

B) b*1.13

1) Since the College textbook's price has been raised up 13%, then we can write:

b(1 +0.13)

b(1.13)

Plugging b = $197 we have:

197(1 +0.13)

197 (1.13)

$222.61

2) So the factor that expresses that difference (13% up) is 1.13

For 1 is equivalent to 100% and 0.13 to 13%

3) Hence, the answer is b* 1.13 calling b that $197.