Simplify the following text for a Grade 5 native English-speaking person.
Original: The hanging cluster is known as a bunch , comprising 3 â `` 20 tiers , or commercially as a `` banana stem '' , and can weigh from 30 â .
Simplified: The total of the hanging clusters is known as a bunch , or commercially as a `` banana stem '' . There are between three and twenty tiers to a bunch .