For illustrative purposes, this is broadly equivalent to the average fee income from seven non-boarding pupils, although there are significant variations in the size and fees of each school.
At ddibenion enghreifftiol, mae hyn yn cyfateb yn fras i'r incwm cyfartalog o ffioedd saith disgybl dibreswyl, er bod amrywiadau sylweddol o ran maint a ffioedd pob ysgol.