if i get paid 40 dollars a week for about 2 1/2 months how much will i make?

2 1/2 months = 2 1/2 x 4 = 10 weeks
how much you will make after 2 1/2 months = 10 weeks x 40 = 400 dollars

$400.00.

10 weeks at $40 = $ 400

400 dollars

400

I really do hope that no one answers this for you.
Use a calculator, if you cannot work this out then you are not grown up enough to work.