List the sum of the balances of all customers for each sales rep. $20$

Customer

$\backslash$table$[[$CUST$\_$ID$,$FIRST$\_$NAME,LAST$\_$NAME,ADDRESS,CITY,STATE,POSTAL,EMAIL,BALANCE,CREDIT$\_$LIIMIT,REP$\_$ID$],[125,$Joey,Smith,$17$ Fourth St$,$Fulton,CA$,82414,$jsmith$17$@example.com,$80\mathrm{.}68,500,05],[182,$Billy,Rufton,$21$ Simple Cir,Grove,CA$,82435,$billyruff@example.com,$43\mathrm{.}13,750,10],[227,$Sandra,Pincher,$53$ Verde Ln$,$Congaree,CA$,82440,$spinch$2$@example.com,$156\mathrm{.}38,500,15],[294,$Samantha,Smith,$14$ Rock Ln$,$Northfield,CA$,82440,$ssmith$5$@example.com,$58\mathrm{.}6,500,10],[314,$Tom,Rascal,$1$ Rascal Farm Rd$,$Fulton,CA$,82414,$trascal$3$@example.com,$17\mathrm{.}25,250,15],[375,$Melanie,Jackson,$42$ Blackwater Way,Mesa,CA$,82433,$mjackson$5$@example.com,$252\mathrm{.}25,250,05],[435,$James,Gonzalez,$16$ Rockway Rd$,$Almondton,CA$,82450,$igonzo@example.com,$230\mathrm{.}4,1000,15],[492,$Elmer,Jackson,$22$ Jackson Farm Rd$,$Grove,CA$,82435,$ejackson$4$@example.com,$45\mathrm{.}2,500,10],[543,$Angie,Hendricks,$27$ Locklear Ln$,$Congaree,CA$,82440,$ahendricks$7$@example.com,$315,750,05],[616,$Sally,Cruz,$19918$ th Ave,Northfield,CA$,82440,$scruz$5$@example.com,$8\mathrm{.}33,500,15],[721,$Leslie,Smith,$123$ Sheepland Rd$,$Mesa,CA$,82433,$Ismith$12$@example.com,$166\mathrm{.}65,1000,10],[795,$Randy,Blacksmith,$75$ Stream Rd$,$Grove,CA$,82414,$rblacksmith$6$@example.com,$61\mathrm{.}5,500,05]]$

Sales$\_$rep

$\backslash$table$[[$REP$\_$ID$,$FIRST$\_$NAME,LAST$\_$NAME,ADDRESS,CITY,STATE,POSTAL,CELL$\_$PHONE,COMMISSION,RATE$],[05,$Susan,Garcia,$42$ Mountain Ln$,$Grove,CA$,82414,307-824-1245,12743\mathrm{.}16,\mathrm{.}04],[10,$Richard,Miller,$87$ Pikes Dr$,$Fullton,$CA,82440,307-406-4321,20872\mathrm{.}11,\mathrm{.}06],[15,$Donna,Smith,$312$ Oak Rd$,$Northfield,CA$,82440,307-982-8401,14912\mathrm{.}92,\mathrm{.}04],[20,$Daniel,Jackson,$19$ Lookout Dr$,$Sefton,$CA,82433,307-883-9481,0,\mathrm{.}04]]$