We know that
• Together they earned $12.50 an hour for 10 hours of work.
We just have to multiply to find the total earnings.
![12.50\cdot10=125](https://img.qammunity.org/2023/formulas/mathematics/college/fo9zxj3jo4uyi1cj9hz7zahnvupcxjku7a.png)
They earned $125 together. Each of them earned $62.50 since they received half of the earnings each.
If he bought a CD, then we can express
![62.50-(CD)](https://img.qammunity.org/2023/formulas/mathematics/college/99ly5kqfxdp50bqam9cv8iyt07dyzbsszn.png)
Therefore, the remaining money would be expressed as 62.50 - (CD).