Industrial stochiometry

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Hi i need some help with a stochiometry problem can you help me please ?
A + B = C
I put 700 kg of A inside a reactor B is already in the reactor and i get C.

The molar mass are : A 70.0 g/mol B 2.0 g/mol C 72.0 g/mol. The excess rate of B is 50 % and the variation rate of the A is 80 %.

I'm sorry for asking this here my teacher is mad at me and won't help me because i missed 1 class because i had to study for an important thesis. Thanks you