The cost of gold is £30 per gram. Calculate the cost of the gold used in the 9 carat gold ring. Use Table 3.
How to approach this question
1. Find the mass of gold in the ring from Table 3.
2. Find the cost of gold per gram from the question.
3. Multiply the mass of gold by the cost per gram to find the total cost.
Full Answer
Cost = mass of gold × cost per gram
Cost = 1.9 g × £30/g = £57
From Table 3, the mass of gold in the ring is 1.9 g.
The question states that the cost of gold is £30 per gram.
To find the total cost of the gold in the ring, we multiply the mass by the cost per gram:
Cost = 1.9 g × £30/g
Cost = £57
Common mistakes
✗ Using the total mass of the ring (5.0 g) instead of the mass of gold.
✗ Using the mass of a different metal.
✗ Dividing instead of multiplying.
Expert