Final answer:
To calculate the cost to buy 50mm of steel chain priced at $8.20 per meter, convert millimeters to meters and then multiply by the unit price, resulting in a total cost of $0.41.
Step-by-step explanation:
The question involves a basic unit conversion and a calculation of cost based on a given unit price. The material in question is steel chain priced at $8.20 per metre. To find the cost of 50mm, we need to convert millimeters to meters since the price is given per meter. There are 1,000 millimeters in a meter, hence 50mm is equal to 0.05 meters (50 / 1000). The next step is to calculate the cost by multiplying the length in meters by the unit price:
Cost = Length in meters × Price per meter
Cost = 0.05 meters × $8.20/meter = $0.41. So, the cost to buy 50mm of steel chain is $0.41.