Afactory producction uniformly increased every year. if it produced 1200 cara in 4 month 1800 cars in 9 month what is the increse in production every year
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a4= 1200
a9=1800
a+3d=1200........(1)
a+8d=1800..........(2)
(2)-(1)
5d=600
d=120
from (1)
a+360=1200
a=1200-360
= 840
therefore, every the factory has an increase of 840 units.
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