1.

Solve this question plz....​

Answer»

Step-by-step explanation:

a+3d=550

a+6d=625

- - -

-3d= -75

d=25

a+3d=550

a=550-75

a=475

i) the production in FIRST YEAR is 475 units.

ii) S15=15/2[2(475)+14(25)]

=15/2[950+350]

=15/2*1300

=15*650

=9750 units

iii) t15=a+14d

=475+14(25)

=475+350

=825 units



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