Lead-free solder is a useful mixture of metals designed for joining electronic components.
Table 1 shows the mass of the metals in a sample of lead-free solder.
| Metal | Mass in grams |
|---|---|
| Tin | 378.4 |
| Silver | 14.8 |
| Copper | 4.2 |
| Antimony | 2.6 |
What name is given to a mixture that has been designed as a useful product, such as solder?
Calculate the percentage by mass of silver in this sample of lead-free solder. Give your answer to 1 decimal place.