The Magic Box is offering a 15% discount on all items over $100. A wooden rocking horse at the store has a price of $140.
Which proportion below would be used to determine the discount amount?
a) 15/100 = x/100
b) 15/140 = x/100
c) 15/100 = x/140
d) 15/140 = 100/x
Plsss show work!