Answer:
Option (D) is correct.
Explanation:
Given that,
Total invoices = 30,800
Number of computers = 2
Rate at which invoices produces by first computer = 7,700 per hour
Rate at which invoices produces by second computer = 6,800 per hour
Number of invoices produces by each computer:
= Total invoices ÷ Number of computers
= 30,800 ÷ 2
= 15,400
Now, the time taken by the first computer to reach out its goal of 15,400:
= Number of invoices produces by First computer ÷ Rate of producing invoices
= 15,400 ÷ 7,700
= 2 hours
The total invoices produced by the second computer in 2 hours:
= Rate at which it produces invoices × 2 hours
= 6,800 per hour × 2 hours
= 13,600
So, the number of invoices still need to produce by the second computer is as follows:
= Total invoices produces by second computer - Total invoices produces in 2 hours
= 15,400 - 13,600
= 1,800
