Find the english error and explain it

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IBM has laid off 20 percent of their workforce with a signature on a single piece of paper

Find the english error and explain it

Jawaban Terkonfirmasi

Kalau IBM nya singular maka IBM has, dan their diganti dengan its
IBM has laid off 20 percent of its workforce by signing a signature on a single piece of paper
Kalau IBM nya plural maka menjadi IBM have, dan their dipertahankan 
IBM have laid off 20 percent of their workforce by signing a signature on a single piece of paper