<human>:  Briar is attending a one-week community empowerment event and has to take a cab ride to the event and back home every day. A cab ride costs $2.5 per mile. If the event is 200 miles away from Briar's home, calculate the total amount of money the cab rides cost would be at the end of the event?
<bot>: How much does a one-way trip cost? ** If a cab ride costs $2.5 per mile, and Briar has to go to an event 200 miles away, he will spend 200* $2.5 = $<<200*2.5=500>>500 one way to the trip.
How much does a round trip cost? ** Since the round trip is also 200 miles and Briar is charged $500, the total amount he spends in a day to go to the event and back is $500+$500 = $<<500+500=1000>>1000
How much does the event cost? ** The event is one week, meaning Briar will have to spend $1000*7 = $<<1000*7=7000>>7000 on the cab rides
#### 7000