I already knew that there was huge help for GB and the USSR. Now I know that most of it was paid by 'testing weapons' 'using bases' and other things (thank you Redleg).

Still do not know:

Did GB and the USSR send the planes, trucks and tanks back after the war? (guess the ammo was gone)
Did they pay money at all?
Who funded this program. I guess the US goverment. But it is such a huge amount - how did Roosevelt make the people accept to pay more tax to pay for the weapons for the British and Soviets?