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8.2 WHICH IS CHEAPER: THE 12¢ OR THE 18¢ PREPAID PHONE CARD? - FINANCIAL
MATH, SIMPLE MATHEMATICS, EXAMPLES FOR PERSONAL FINANCES
Card
A charges you 18¢ a minute. To make a call from a phone booth will cost you a two minute charge to make the initial connection plus the per-minute charge for talking.
Card B charges you 12¢ a minute. To make a call from a phone booth costs you $1.00 to connect plus the per-minute charge for talking on the phone.
== For a one minute call:
Card A = $ .54
Card B = $1.12
== For a five minute:
Card A = $1.26
Card B = $1.60
== How about a ten minute call?
Card A = $2.16
Card B = $2.20
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