The monthly payment is $386.67.
<h3>
What is the monthly interest rate?</h3>
- A monthly interest rate is simply the amount of interest charged in one month. 
- This does not include any other fees associated with the loan, and it does not indicate how expensive a loan is. 
- APR, on the other hand, is the annual percentage rate charged on a loan for a year.
So, 
- PV = 20,000, I/y = 0.50, n = 12 × 5, FV = 0
- CPT PMT which equals $386.67
Therefore, the monthly payment is $386.67.
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From the critical path that's given, the total crashing cost will be $530.
<h3>What is a critical path?</h3>
A critical path simply means the longest sequence of tasks that one will have to complete in order to complete a project.
In this case, from the information given, the critical path will be:
= 0 + $130 + $400 
= $530
In conclusion, the correct option will be $530.
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A specialized accounting book for accumulating and posting business transactions into specific categories is a ledger.
<h3>What is a ledger?</h3>
A ledger is a specialized accounting tool.  It can also be described as a financial book or computer program.
In the ledger, information from accounting journals is accumulated and posted into specific categories matching the type of accounts.
From the ledger, the trial balance is extracted, which forms the basis for preparing the financial statements that show an entity's financial profitability and position.
Thus, a specialized accounting book for accumulating and posting business transactions into specific categories is a ledger.
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