The correct answer is: A. 20%
Margin of safety is the amount of sales revenue that a company can lose before it starts to incur a loss. It is calculated as follows:
Margin of safety = Budgeted sales – Break-even sales
Break-even sales = Fixed costs / Contribution margin per unit
Contribution margin per unit = Selling price per unit – Variable cost per unit
In this case, the margin of safety is calculated as follows:
Margin of safety = 30,000 units * Rs 12 per unit – 98,000 units / Rs 4 per unit = Rs 60,000
The margin of safety expressed as a percentage of budgeted sales is calculated as follows:
Margin of safety percentage = Margin of safety / Budgeted sales * 100%
= Rs 60,000 / 30,000 units * 100% = 20%
Therefore, the margin of safety, expressed as a percentage of budgeted sales, is 20%.
Option A is the correct answer. Option B is incorrect because the margin of safety is not 25%. Option C is incorrect because the margin of safety is not 73%. Option D is incorrect because the margin of safety is not 125%.