Answer:
b. 4 percent
Explanation:
According to the rule of 72, hte number of years required for an investment to be doubled can be obtained by dividing 72 by the interest rate (in percentage). If it takes 18 years for the investment to bouble in value, the interest rate is:

The interest rate on the deposit is 4%.
The number of books that will be produced such that the costs from the two methods be the same is 4668 units.
From the complete question, the total cost of the first equation will be:
= 8.25x + 65054
The total cost for the second equation will be:
= 19.50x + 12539
Then, we'll equate both equations together and this will be:
8.25x + 65054 = 19.50x + 12539
Collect like terms
19.50x - 8.25x = 65054 - 12539
11.25x = 52515
Divide both side by 11.25
11.25x/11.25 = 52515/11.25
x = 4668 units.
Therefore, the breakeven unit will be 4668 units.
Read related link on:
brainly.com/question/25265523