A Machine in a factory has an error rate of 10

per 100. The machine normally runs 24 hours a day and produces 30 parts per hour. Yesterday the machine was shut down for 4 hours for repairs. How many good parts did it produce yesterday?

540 good parts were produced yesterday

Step-by-step explanation:

1. Let's review the information given to us to answer the question correctly:

Machine's error rate = 10% or 0.1

Hourly production of the machine = 30 parts

Number of hours the machine was shut down yesterday = 4 hours

2. How many good parts did it produce yesterday?

For answering this question, we will make the following calculation:

Yesterday's good production = (Total hours the machine works * Hourly production of the machine) - (Total hours the machine works * Hourly production of the machine * Machine's error rate)

Replacing with the real values, we have:

Yesterday's good production = (20 * 30) - (20 * 30 * 0.1)

Yesterday's good production = 600 - 60

Yesterday's good production = 540 parts