Final answer:
Prime cost calculation requires direct material and direct labor costs but excludes manufacturing overheads. Without information on direct costs in the question, we cannot calculate the prime cost. Examples provided show how to calculate prime cost if direct costs were known.
Step-by-step explanation:
The question asks to calculate the prime cost, which is a term used in accounting, specifically in cost accounting. It represents the direct costs of manufacturing a product, which include direct materials and direct labor costs but excludes manufacturing overheads. The information provided does not specify the direct costs explicitly, but it mentions manufacturing overheads of Rs. 30,000. To calculate the prime cost, we would need additional details regarding the costs of direct materials and direct labor. For instance, using Example C from the provided information, if workers cost $90 (which can be considered as direct labor) and machines cost $80 (which could possibly be part of manufacturing overheads), only the workers' cost would contribute to the prime cost.
Since we don't have the specific costs for direct materials or direct labor for the student's case, we can't provide the calculation. However, as shown in the 'Cost of technology' examples, if the information were provided such as '7 x $40' and '3 x $40', which total to $280 and $120 respectively, and these were direct material costs, we would add these amounts to direct labor costs to find the prime cost for that scenario.