If a supplier/ says 10+1 on item,normal price is £54 10+1 is £50. What does this mean?

Bit confused with the terminology as i am new to this. Any info would be great. Thanks in advance. or:Bit confused with the terminology as i am new to

Bit confused with the terminology as i am new to this. Any info would be great. Thanks in advance.

or:Bit confused with the terminology as i am new to this. Any info would be great. Thanks in advance.

Tags:price,confused,bits,normal,