Answer:
![Change = \$8](https://img.qammunity.org/2022/formulas/mathematics/college/fjmp1001l40iu6am3gpldukbaaq9o2of1m.png)
Explanation:
Given
(4)
![Shirt = \$42](https://img.qammunity.org/2022/formulas/mathematics/college/3smchgk6rhfushp21ob4ywe9t9rheb5t3k.png)
![Sweater= \$30](https://img.qammunity.org/2022/formulas/mathematics/college/605q9fhkmeti9xuxulnqk5p3q8c3kh3mpc.png)
Required
The change
First, we determine the amount paid,
To do this, multiply the number of bills by the worth of each bill.
So, we have:
![Amount = 4 * \$20](https://img.qammunity.org/2022/formulas/mathematics/college/acs1tg3xbom85aw1kzbyav3wpa3lxqqhig.png)
![Amount = \$80](https://img.qammunity.org/2022/formulas/mathematics/college/s2dfwprjushgpvckadrmi8t5efm1rf6bi6.png)
Next, calculate the worth if item bought
![Items = \$42 + \$30](https://img.qammunity.org/2022/formulas/mathematics/college/bnucwcyoohgjklvjr556ffk67y7mgdvjc6.png)
![Items = \$72](https://img.qammunity.org/2022/formulas/mathematics/college/wnu1cuiua4lb55k5hwhmp2ogdaf6kwsvqs.png)
Subtract the items from the amount to get the change.
![Change = \$80 - \$72](https://img.qammunity.org/2022/formulas/mathematics/college/22ibwdbfn4rb20m1et8dbtmgycyejl939m.png)
![Change = \$8](https://img.qammunity.org/2022/formulas/mathematics/college/fjmp1001l40iu6am3gpldukbaaq9o2of1m.png)