Question

Amit saves certain amount every month in a specific way. In the first
month he saves 200, in the second month 250, in the third month
300 and so on. How much will be his total savings in 17 months ?​

Answer 1

his savings forms an A.P

therefore a=200

                 d = 50

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

S17 = 17/2 [2 *200+(17-1)*50]

      = 17/2 [400 + 16*50]

      = 17/2 [400+800]

      =17/2 x 1200

      = 17 x 600

       = Rs 10,200

Answer 2

200,250 ,300,..... are in ap

a=200 d= 50

Sn= n/2 ( 2a+( n-1 )d)

S17 = 17/2 (2× 200+(17-1)50)

= 17/2 (400+16×50)

= 17/2 (400+800)

17/2 × 1200

17× 600

10200