<PRE><B>Question 1173391</B>
&lt;br&gt;
{{{30+0.50(x-60) &lt;= 50}}}
{{{0.50(x-60) &lt;= 20}}}
{{{x-60 &lt;= 40}}}
{{{x &lt;= 100}}}&lt;br&gt;
ANSWER: 100 minutes&lt;br&gt;
Informally (good mental exercise!):&lt;br&gt;
$30 basic charge leaves $20 for minutes above 60.&lt;br&gt;
$20 at $0.50 per minute ($1 per 2 minutes) means 2*20=40 minutes above 60.&lt;br&gt;
So the total number of minutes is at most 60+40 = 100.&lt;br&gt;
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