Which of the following is not a sub-system of Accounting Information System?

Given:

• Cost of goods = Rs. 80,000
• Profit = 20% on sales

When profit is stated as a percentage on sales, it means profit is calculated as a percentage of the selling price (not on cost).

Let Sales Value = $S$S

The relationship can be expressed as:
$$\text{Profit} = 20\% \text{ of } S = 0.20S$$Profit=20% of S=0.20S

Also, we know:
$$\text{Sales} = \text{Cost} + \text{Profit}$$Sales=Cost+Profit

Substituting the values:
$$S = 80,000 + 0.20S$$S=80,000+0.20S

$$S - 0.20S = 80,000$$S−0.20S=80,000

\0.80S = 80,000$$$$S = \frac{80,000}{0.80} = 1,00,000$

Therefore, Gross Profit = Sales - Cost = 1,00,000 - 80,000 = Rs. 20,000

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Verification: Profit as percentage of sales = $\frac{20,000}{1,00,000} \times 100 = 20\%$1,00,00020,000​×100=20% ✓

The correct answer is Option 3: Rs. 20,000/-