x( 1+25%)= 1560
x = 1560/ 1.25 = 1248
The profit of Book A is1560-1248 = 312 yuan.
The cost of setting up a B book is Y yuan.
y( 1- 10%)= 1350
y= 1350/0.9= 1500
The loss of Book B is1500-1350 =150 yuan.
3 12- 150= 162
The bookstore made a profit this day 162 yuan.