Custom Woocommerce Function

[tascam424]

I was wondering if anybody would be so kind as to help me write a woocommerce function.

I am by no means a coder so i really appreciate any help you can offer.

 

What i wish to achieve is for a function to calculate the quantity of items in cart and then change the total order price based on predefined values.

 

So for example all items are £2.50 .. what i want is for the function to count the items and if 5 items are in the cart change the cart total to £10 .. if 10 items are added change the cart total to £20.00.

 

I am aware of some discount plugins which may achieve something similar, but i don't actually want to apply a discount, i would really prefer to change the total automatically and not display a discount.

 

Once again i greatly appreciate any help.