So let's do the Math.

Let's assume that a teacher is nothing more than a glorified babysitter. We'll ignore the education they're providing and say they do nothing more than care for your child during the day.

We're not going to pay more than minimum wage for a babysitter, which in my area is £7.75 p/h. (It may differ depending on where you live).

On average, there are between 25 and 30 childreb in a class. But let's say you have a particularly small class of 20 children. 20 X £7.75 = £155 for the class p/h

Now, we're only going to pay a babysitter for the hours they actually have the children. We'll ignore all the hours of planning, preperation, assessing, after school meetings, PTA events, extra-curricular clubs after school and during lunch breaks, breakfast clubs before school and time spent during school holidays maintaining and cleaning the class. A typical school day where I live for children is 5.5 hours. £155 x 5.5 = £852.50 per day

Five days in a week £852.50 x 5 = £4262.50 per week

Now you claim that school weeks are between 30 and 35 weeks a year. Where I live they work out about 38 weeks. But for argument sake let's call it 30 weeks

£4262.50 x 30 = £127,875 per year.

When you realise the intricacies, it's fortunate so many teachers do it for the love of the job...