Final answer:
The original cost of the machinery to be recorded in Pearl's books is $9,000.
Step-by-step explanation:
The original cost of the machinery to be recorded in Pearl's books is d) $9,000.
The original cost of the machinery includes the purchase price of $9,000 and the installation and delivery charges of $300 and $200, respectively. The total cost of the machinery is $9,500 ($9,000 + $300 + $200).
However, since Pearl uses the straight-line depreciation method, the estimated salvage value of $1,500 should be subtracted from the total cost. Therefore, the original cost of the machinery to be recorded in Pearl's books is $9,000 ($9,500 - $1,500).