Answers

2016-07-03T19:56:20+08:00
3400 base salary

3 years is 36 months

200(monthly salary increase)x36(months)
=7200

7200+3400= 10600 the salary of the clerk in 3 years.
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If the second month is 3600, then the third month is 3800, and so on, the equation you used is not applicable.
  • Brainly User
2016-07-04T00:02:08+08:00
Use the formula for sum of arithmetic sequence.

 S_{n}  = n/2 [2(a₁) + (n-1) (d)]

Convert 3 years to months:  3 x 12 = 36 (months)

n = 36
a₁ = 3 400
d = 200

Solution:
S₃₆ = 36/2 [2 (3400) + (36-1)(200)]
S₃₆ = 18 [6800 + (35)(200)]
S₃₆ = 18 [6800 + 7000]
S₃₆ = 18 [13,800]
S₃₆ = 248,400   

ANSWER:  The clerk will receive a salary of 248,400 after 3 years.
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