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Question
Mary got a job with a starting salary of Rs. 15000 /- per month. She will get an increment of Rs. 100 /- per month. What will be her salary after 20 months?
Mary got a job with a starting salary of Rs. 15000 /- per month. She will get an increment of Rs. 100 /- per month. What will be her salary after 20 months?
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Solution
The correct option is C 16900
Mary's starting salary =15000 and increment every month =100.
This forms an AP. 15000,15100,15200,.............. with first term a=15000 and common difference d=100.
Now we find sum up to 20 terms.
15000+15100+15200+........... up to 20 terms
nth term of A.P is
an=a+(n−1)d
a20=15000+19×100
=16900
Mary's starting salary =15000 and increment every month =100.
This forms an AP. 15000,15100,15200,.............. with first term a=15000 and common difference d=100.
Now we find sum up to 20 terms.
15000+15100+15200+........... up to 20 terms
15000+15100+15200+........... up to 20 terms
nth term of A.P is
an=a+(n−1)d
an=a+(n−1)d
a20=15000+19×100
=16900
=16900
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of her salary. What is her salary after the increment?