Answer:
considered to be a direct variable cost
Explanation:
Direct costs refer to those costs which can be directly attributable to a product or an activity. Direct costs are incurred on those products which are directly used in the manufacturing of a finished product.
Variable costs are those costs which change with the production level.
In the given case, motorcycle belt cost can be specifically allocated to the cost of a motorcycle. But the cost is not fixed in nature i.e it depends upon the number of motorcycles produced.
Hence such a cost would be classified as Direct Variable Cost.