Question

required 2500 after 12 weeks to send her daughter to school. she saved ₹100 in the 1st week and increased her weekly saving by 20 rupee evry week. find weather she will be able to send her daughter afte r12 weeks.​

Answer 1

Answer:

Here required money is ₹2500.

a= saving in 1st week = ₹100

d = ₹20

A.T.Q,

100,120,140....upto 12terms

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

Sn = 12/2{2×100+(12-1)×20}

Sn = 6×420

Sn = 2520.

She will be able to send her daughter to school after 12 weeks.

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Answer 2

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Refer the attachment.