Mr. O’Hara has developed a test of mechanical aptitude. At the beginning of a course in auto mechanics, he gives this test to his students. At the end of the year, he compares students’ scores on the test with their actual achievement in his course. What is he probably trying to find out about his test?

It's predictive validity.

Step-by-step explanation:

Predictive validity is the extent to which a score on a scale or test predicts score on some criterion measure.

-Mr O'Hara aims to establish the the students' long-term  performance in the unit auto-mechanics and then seeing if the scores will be correlated to future performance in that specific unit.

180%

Step-by-step explanation:

Set up an equation:

Variable x = percent of markup

102.56/56.98 = x/100

Cross multiply

102.56 × 100 = 56.98 × x

10,256 = 56.98x

Divide both sides by 56.98:

179.99297 = x

Round to nearest whole number:

180 = x

Check your work:

56.98 × 180%

Convert the percentage into a decimal:

56.98 × 1.80

102.564

Round to nearest cent:

102.56

Correct!