Question 981578
.
S=number of stalls=8; b=books per box=12; T=total books needed
.
T=40S+(2b)S+200
T=S(40+2b)+200
T=8(40+2(12))+200
T=8(40+24)+200
T=8(64)+200
T=512+200=712
.
ANSWER: She needs to have 712 books on hand to open 8 stalls.