Asked by Jackie
Mr. Keskin and his wife have a cell phone plan that charges them $5 for 200 text messages per month for each of their phones. The Keskins are charged an additional $0.12 for each text message over their 200-text-message limit. Their carrier has offered them unlimited text messages for both lines for $30. What is the maximum number of text messages that they can send in a month to keep their current plan as the better deal? What is the minimum? Explain.
Answers
Answered by
Steve
for m minutes,
current plan: 5.00 + .12(m-200)
proposed plan: 30.00
so, we want solve
5.00 + .12(m-200) < 30.00
m < 409
current plan: 5.00 + .12(m-200)
proposed plan: 30.00
so, we want solve
5.00 + .12(m-200) < 30.00
m < 409
Answered by
Jackie
Please explain, i'm having trouble understanding.
Answered by
Steve
do you understand the expressions for the current and proposed plans? Those are just symbols for the words that described the plans. Read the problem carefully, and wherever they give some information, write it down in numbers or symbols.
To solve for m, just do the regular steps for solving an equation:
5.00 + .12(m-200) < 30.00
5.00 + .12m - 24 < 30
.12m < 49
m < 408.3
Assuming charges are for whole messages, that means m < 409.
To solve for m, just do the regular steps for solving an equation:
5.00 + .12(m-200) < 30.00
5.00 + .12m - 24 < 30
.12m < 49
m < 408.3
Assuming charges are for whole messages, that means m < 409.
Answered by
Jackie
Ohh ok thank you! I understand now!
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