Question 901635
let cost of book be x

number of scholars be y


x/y = 12
x=12y

scholars increased by 2 
x/(y+2)=8

12y/(y+2)=8

12y=8(y+2)

12y=8y+16
12y-8y=16
4y=16
y=4 number of scholars

x/y = 12
x/4 =12
x=48 cost of book