The monthly sales S (in hundreds of units) of baseball equipment for an Internet sporting goods site are approximated by $S = 60.5 - 48.5 \cos \frac { \pi t } { 6 }$
where $t$ is the time (in months), with $t = 1$ corresponding to January. Determine the months when sales exceed 7700 units at any time during the month.

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The Answer of The monthly sales S (in hundreds of units) of baseball equipment for an Internet sporting goods site are approximated by $S = 60.5 - 48.5 \cos \frac { \pi t } { 6 }$
where $t$ is the time (in months), with $t = 1$ corresponding to January. Determine the months when sales exceed 7700 units at any time during the month.

The Monthly Sales S (In Hundreds of Units) of Baseball S=60.5−48.5cos⁡πt6S = 60.5 - 48.5 \cos \frac { \pi t } { 6 }S=60.5−48.5cos6πt​

The Monthly Sales S (In Hundreds of Units) of Baseball $S = 60.5 - 48.5 \cos \frac { \pi t } { 6 }$