ram saves Rs.320 during the first year. Rs.360 in the second year and Rs.400 in the third year. if he continues his saving in the sequence, in how many years will he saves Rs 20000?
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Answered by
1
Heya!!
refer to given attachment please
refer to given attachment please
Attachments:
vikas324:
answer 25 hai
40-15
15 n and 1000 this eqn how u put tell me
Answer is 25
see again pls
Answered by
0
Sum is given as 20000
The given pattern is in A.P
A.p stands for arithmetic progression
a = 320
d=40
S = n /2 [ 2a + ( n -1) d ]
20000= n/2 [ 640 + 40n-40]
20000=n /2×40 [16+n-1]
20000 × 2 ÷ 40 = 16n + n ^2 -n
1000= n^2 +15n
n^2 +15n -1000=0
n^2 + 40n-25n -1000=0
n (n+ 40) - 25 (n+40)=0
(n+40)(n-25) = 0
n= 25 years
Thank u ★ ★ ★
#ckc
Hope it helps
Plz mark brainliest
The given pattern is in A.P
A.p stands for arithmetic progression
a = 320
d=40
S = n /2 [ 2a + ( n -1) d ]
20000= n/2 [ 640 + 40n-40]
20000=n /2×40 [16+n-1]
20000 × 2 ÷ 40 = 16n + n ^2 -n
1000= n^2 +15n
n^2 +15n -1000=0
n^2 + 40n-25n -1000=0
n (n+ 40) - 25 (n+40)=0
(n+40)(n-25) = 0
n= 25 years
Thank u ★ ★ ★
#ckc
Hope it helps
Plz mark brainliest
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