Iron ore, sugar, grains (rice & wheat)

DEBIT TO ALLOWANCE for Doubtful Accounts and a credit to Accounts Receivable.
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When a specific customer's account is identified as uncollectible, it is written off against the balance in the allowance for bad debts account.
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Answer:
$155,000
Explanation:
Calculation to determine the book value of the investment that should be reported at year end by All Good Company
Initial investment (6,000* $10.00 per share) $60,000
Add: Net income ($450,000*30%) $135,000
Less: Dividend ($40,000)
Ending balance of investment $155,000
($60,000+$135,000-$40,000)
Therefore the book value of the investment that should be reported at year end by All Good Company is $155,000
The firm should decrease the amount of capital used.
Solution:
The wage rate is $12 per hour and capital is rented at $8 per hour.
The marginal product of labour is 45 units of output per hour and the marginal product of capital is 65 units of output per hour.
A manager hires labour and rents capital equipment in a very competitive
market.
The ratio of marginal product of labour and wage rate
= 
= 3.75
The ratio of marginal product of capital and rent
= 
= 8.125
If the cost ratio is higher, it means that the boss must minimize the volume of money involved in the manufacturing process.
I will assume here (since I don't have more information) that each school needs one English and one Accounting professor, but that more people are ready to teach English than accounting (this assumption might be wrong, but it's what think)
therefore the supply is bigger for the English professors than for the Accounting professors -this means that the accounting professors can ask for bigger salary (the bigger the supply, the smaller the prize)