Respuesta :

Cost of a book has been increased from $6 to $10.

So, increase in cost= 10-6=4.

Now percent increase=[tex] \frac{Increase in cost}{original cost} [/tex]

=[tex] \frac{4}{6} [/tex]

=[tex] \frac{4}{6} *100% [/tex]

=0.667*100%

= 66.7%