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:
$13.5
cost of 1 text message= $1.80÷12 =$0.15
cost of 90 messages = $0.15×90 = $13.5
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