Lena purchased a prepaid phone card for $20. Long distance calls cost 21 cents a minute using this card. Lena used her card only
once to make a long distance
call. If the remaining credit on her card is $12.23, how many minutes did her call last?
1 answer:
Answer:
Step-by-step explanation:
Since she used $
7.77
for her only call and since one call costs $0.21 per minute, you you can compute number of minutes she spent for her last call.
How did we find $7.77:
$20-$12.23= $7.77
Now, $7.77 : $0.21= 37 minutes
Her call lasted 37 minutes
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