A man saves Rs.320 during the first year,Rs.360 in the 2nd year,Rs.400 in the 3rd year and so on.In how many years will he save Rs.20000
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a1=320
a2=360
a3=400
d=a3-a2=a2-10a1
d=400-360=360-320
d=40
an=20000=a+(n-1)d
20000=320+(n-1)40
20000-320=(n-1)40
19680/40=n-1
492+1=n
n=493 years save 20000rs
a2=360
a3=400
d=a3-a2=a2-10a1
d=400-360=360-320
d=40
an=20000=a+(n-1)d
20000=320+(n-1)40
20000-320=(n-1)40
19680/40=n-1
492+1=n
n=493 years save 20000rs
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