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Recruitment of parallel factory

Suppose that X Class A machines are produced in the first quarter.

( 1+ 10%)x+( 1+20%)(480-x)= 554

1. 1x+576- 1.2x = 554

0. 1x=22

x=220 480-220=260

In the first quarter, 220 Class A machines and 260 Class B machines were produced.