10. Yasmeen saves ?32 during the first month, ? 36in the second month – InterviewSolution

InterviewSolution

1.	10. Yasmeen saves ?32 during the first month, ? 36in the second month and ?40 in third month. Ifshe continues to save in this manner, in howmany months will she save 2,000?
Answer» AP formed is 32,36,40.......nSn=2000a=32, d=4Sn=n/2 [2a+(n-1)d]2000=n/2[64+4n-4]4000=4n2+60n4n2+60n-4000=0n2+15n-1000=0n2+40n-25n-1000=0by solving we get n = 25 and -40.As months cant be negative we take positive value. Therefore She will save Rs 2000 in 25 months.

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