Question

in a district co operative bank mr surendra invested Rs. 500 in 2001 , Rs . 1500 in 2002 , Rs. 2500 in 2003. if he keeps on investing in the blanks upto 2020in the same manner how much investment will there be in his account at the end of 2020 ?

Answer 1

Answer:200000

Step-by-step explanation:

Answer 2

Answer:

Mr surender's investment in 2001, a= Rs 500

Increase in investment each year,d=Rs1000

No. of years, n=20

Investment in his account in 2020= Sn

   As (500,1500,2500,....) are in A.P

Step-by-step explanation:

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

    =20/2 [2*500+ 19*1000]

    =10[1000 +19000]

     =10 [20000]

      =200000

Therefore his total investment in 2020 is Rs2,00,000.