Question

it cost christopher $0.80 to send 8 text messages. how much would it cost to send 199 text messages?

Explanation:

Step1: Find cost per text

$\text{Cost per text} = \frac{\$0.80}{8} = \$0.10$

Step2: Calculate cost for 199 texts

$\text{Total cost} = 199 \times \$0.10$

Answer:

$\$19.90$