Question

It cost Cai $1,80 to send 12 text messages, How much would it cost to send 90 text
messages?

Answer 1

Answer: $13.50 for 90 text messages

Explanation:

$0.15×90 = $13.5

$0.15 is the unit rate for 1 text message cost.

Answer 2

$13.5

Explanation:

cost of 1 text message= $1.80÷12 =$0.15

cost of 90 messages = $0.15×90 = $13.5