Question

Aditi required rupees fire 2500 after 12 weeks to send her daughter to school she saved rupees hundred in the first week and increase her weekly saving a Rupees20 every week find whether she will be able to send her daughter after 12 weeks what value he is generated in the above situation

Answer 1

A=100 ,d=20and n=12
Sn=n/2(2a+(n-1)d)
Sn=12/2(2*100+(12-1)20)
=6(200+11(20))
=6(200+220)
=6(420)
=2520
yes she will be able to send her daughter to school
value:small savings can helps us a lot

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 .