Diamondback Topanga with White Rockshox - Whats it worth??

[Transporter]

Howdy, newbie here,
I have an 18” Diamondback Topanga with white RockShox Indy’s that’s for sale. The bike is in overall great mechanical order, and cosmetically good condition with no structural defects etc. It’s being sold as part of a bike maintenance project I’m doing with the local primary school, the proceeds of the sale will go towards bike maintenance equipment for the school project.
But I need to get a realistic idea of a fair selling price, any thoughts??

 

[hamster]

£50? It has real value as transport but as the lowest one in the range is not exactly desirable. It's the sort of bike that would make a brilliant commuting machine.

 

[Transporter]

Thanks Hamster for the guidance