Sample table: orders

$\backslash$table$[[$ord$\_$no$,$purch$\_$amt,ord$\_$date,customer$\_$id$,$salesman$\_$id$],[,-------------,---------,-----------,----------],[70001,150\mathrm{.}5,2012-10-05,3005,5002],[70009,270\mathrm{.}65,2012-09-10,3001,5005],[70002,65\mathrm{.}26,2012-10-05,3002,5001],[70004,110\mathrm{.}5,2012-08-17,3009,5003],[70007,948\mathrm{.}5,2012-09-10,3005,5002],[70005,2400\mathrm{.}6,2012-07-27,3007,5001],[70008,5760,2012-09-10,3002,5001]]$

Sample table: customer

$\backslash$table$[[$customer$\_$id$,$cust$\_$name,cIty,I grade,salesman$\_$id$],[3002,$Nick Rimando,New York,$100,5001],[3007,$Brad Davis,New York,$200,5001],[3005,$Graham Zusi,California,$200,5002],[3008,$Julian Green,London,$300,5002],[3004,$Fabian Johnson,Paris,$300,5006],[3009,$Geoff Cameron,Berlin,$100,5003],[3003,$Jozv Altidor,Moscow,$200,5007]]$

Using the tables above, how much $($purch$\_$amt$)$ has Graham Zusi ordered? Show your work.