172. At the end of 2018, Hargreaves Company implemented a new labor process and redesigned its product with the expectation that input usage efficiency would increase. Now, at the end of 2019, the president of the company wants an assessment of the changes on the company's productivity. The data needed for the assessment are as follows:

2018

2019

Output

66,000

85,000

Output prices

$12

$14

Materials (lbs.)

24,800

25,550

Materials unit price

$5

$7

Labor (hrs.)

25,000

30,875

Labor rate per hour

$9

$9.50

Power (kwh)

12,280

18,955

Price per kwh

$4

$4.50

What is the partial operational measure for materials for 2018? (Round the answer to two decimal places.)

a. 2.04

b. 3.33

c. 2.66

d. 1.63