What is the range for the data set?
13, 14, 17, 18, 23, 27, 28, 31,34
A)21
B)14
C)15.5
D)29.5

A) 21

Explanation:

when calculating range, subtract the highest number in the data set  by the lowest number, that should give you the range. In this case, the highest number is 34 and the lowest is 13, making the range 21 :)

step-by-step explanation:

100%     = 120

1%= 120/100=   1.2

9%   = 1.2 x 9=     10.8

10.80 to the 120 to get $130.80