Question

Anvar saves some amount every month. In first three months he saves ` 200, . 250 and ` 300 respectively. Inwhich month will he save 1000?​

Answer 1

$\huge\star\mathfrak\pink{{Answer:-}}$

Solution: Saving in first month ` 200; Saving in second month ` 250; ..... 200, 250, 300, . . . this is an A.P. Here a = 200, d = 50, Let’s find n using t

n formula and then find Sn

: tn = a+(n-1)d

= 200 +(n-1)50

= 200 + 50n - 50

1000 = 150 + 50n

150 + 50n = 1000

50n = 1000 - 150

50n = 850

:n = 17

In the 17th month he will save ` 1000.

Let’s find that in 17 months how much total amount is saved.

Sn= n2 [2a+(n-1)d]

= 172 [2 ´ 200+(17-1) ´ 50]

= 172 [400 + 800]

= 172 [1200]

= 17 x600

= 10200

:In 17 months total saving is 10200.

Answer 2

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