Question

ramkali required rs 2500after 12 weeks .she saved rs 100 in first week and increased her saving by rs 2o every week .will she able to collect the required money

Answer 1

yes she will be able to collect the required money

Answer 2

AP = 100+120+140+An

N = 12

A = 100

D = 20

An = A+(N-1)D

= 100+(12-1)20

= 100+220 = 320

The required An = 320

Then , Sn = N÷2{2A+(N-1)D}

= 12÷2 {2×100+(12-1)20}

= 6×450 = 2520

So , she will be able to send her daughter to school after 12 weeks .