"去年的奖金是多少？"

Translation: How much was the bonus last year?

[Karoliina765050]

'How much was last year's bonus?' should be accepted.

[KX3.]

I agree!

[RichardWrigley]

"How much was last year's bonus?" Exactly. I also agree.

[GrantTimme]

This app has explicit possessives such as a 's block. Since there was no possessive, that answer is not accepted

[ElGringoMamado]

How much was the bonus for last year should be accepted too. This kind of thing is frustrating..

[KX3.]

It's not really idiomatic, and yeah, it sure is.

[Simon299426]

"How much was last year's bonus?" still not accepted. Reported 13th December 2018.

[Simon299426]

Still not accepted on 24th January 2019. Duly reported again...

[zerp349902]

is the 是 necessary here?

[KX3.]

Yes, you can then use the same structure for the answer, substituting 多少 with the figure.

[Jacques439990]

Why "last year's bonus" is wrong?????

[RajasDaithankar]

Same as last Christmas's sales.

[Eoin790683]

Multiple valid translations not accepted, this whole section is turning into a copy-paste job!